test-example-projects/c++_projects/280w-mysql-8.0.18/mysql-test/r/union.result

drop table if exists t1,t2,t3,t4,t5,t6;
CREATE TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
CREATE TABLE t2 (a int not null, b char (10) not null);
insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
analyze table t2;
Table	Op	Msg_type	Msg_text
test.t2	analyze	status	OK
select a,b from t1 union distinct select a,b from t2;
a	b
1	a
2	b
3	c
4	d
5	f
6	e
select a,b from t1 union all select a,b from t2;
a	b
1	a
2	b
3	c
3	c
3	c
4	d
5	f
6	e
select a,b from t1 union all select a,b from t2 order by b;
a	b
1	a
2	b
3	c
3	c
3	c
4	d
6	e
5	f
select a,b from t1 union all select a,b from t2 union select 7,'g';
a	b
1	a
2	b
3	c
4	d
5	f
6	e
7	g
select 0,'#' union select a,b from t1 union all select a,b from t2 union select 7,'gg';
0	#
0	#
1	a
2	b
3	c
4	d
5	f
6	e
7	gg
select a,b from t1 union select a,b from t1;
a	b
1	a
2	b
3	c
select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b;
t1	b	count(*)
t1	a	1
t1	b	1
t1	c	2
t2	c	1
t2	d	1
t2	f	1
t2	e	1
(select a,b from t1 limit 2)  union all (select a,b from t2 order by a) limit 4;
a	b
1	a
2	b
3	c
4	d
(select a,b from t1 limit 2)  union all (select a,b from t2 order by a limit 1);
a	b
1	a
2	b
3	c
(select a,b from t1 limit 2)  union all (select a,b from t2 order by a limit 1) order by b desc;
a	b
3	c
2	b
1	a
(select a,b from t1 limit 2)  union all (select a,b from t2 order by a limit 1) order by t1.b;
ERROR 42000: Table 't1' from one of the SELECTs cannot be used in global ORDER clause
explain (select a,b from t1 limit 2)  union all (select a,b from t2 order by a limit 1) order by b desc;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
2	UNION	t2	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using filesort
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using temporary; Using filesort
Warnings:
Note	1003	(/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` limit 2) union all (/* select#2 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` order by `test`.`t2`.`a` limit 1) order by `<union temporary>`.`b` desc
select count(*) from (
(select                      a,b from t1 limit 2)  union all (select a,b from t2 order by a)) q;
count(*)
6
(select sql_calc_found_rows  a,b from t1 limit 2)  union all (select a,b from t2 order by a) limit 2;
a	b
1	a
2	b
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
6
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
select count(*) from (
select                      a,b from t1  union all select a,b from t2) q;
count(*)
8
select sql_calc_found_rows  a,b from t1  union all select a,b from t2 limit 2;
a	b
1	a
2	b
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
8
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
explain 
select * from t1 where a in
(select a from t1 union select a from t1 order by (select a))
union select * from t1 order by (select a);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using where
2	DEPENDENT SUBQUERY	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using where
3	DEPENDENT UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using where
NULL	UNION RESULT	<union2,3>	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using temporary
5	UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
NULL	UNION RESULT	<union1,5>	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using temporary; Using filesort
6	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	#	#	No tables used
Warnings:
Note	1276	Field or reference 'a' of SELECT #4 was resolved in SELECT #2
Note	1276	Field or reference 'a' of SELECT #6 was resolved in SELECT #1
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` where (<cache>(`test`.`t1`.`a`) = `test`.`t1`.`a`) union /* select#3 */ select 1 from `test`.`t1` where (<cache>(`test`.`t1`.`a`) = `test`.`t1`.`a`))) union /* select#5 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` order by (/* select#6 */ select `<union temporary>`.`a`)
explain select a,b from t1 union all select a,b from t2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
2	UNION	t2	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` union all /* select#2 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2`
explain select xx from t1 union select 1;
ERROR 42S22: Unknown column 'xx' in 'field list'
explain select a,b from t1 union select 1;
ERROR 21000: The used SELECT statements have a different number of columns
explain select 1 union select a,b from t1 union select 1;
ERROR 21000: The used SELECT statements have a different number of columns
explain select a,b from t1 union select 1 limit 0;
ERROR 21000: The used SELECT statements have a different number of columns
select a,b from t1 into outfile 'skr' union select a,b from t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union select a,b from t2' at line 1
select a,b from t1 order by a union select a,b from t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union select a,b from t2' at line 1
insert into t3 select a from t1 order by a union select a from t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union select a from t2' at line 1
INSERT INTO t3 SELECT a FROM t1 LIMIT 1 UNION SELECT a FROM t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT a FROM t2' at line 1
create table t3 select a,b from t1 union select a from t2;
ERROR 21000: The used SELECT statements have a different number of columns
select a,b from t1 union select a from t2;
ERROR 21000: The used SELECT statements have a different number of columns
select * from t1 union select a from t2;
ERROR 21000: The used SELECT statements have a different number of columns
select a from t1 union select * from t2;
ERROR 21000: The used SELECT statements have a different number of columns
select * from t1 union select SQL_BUFFER_RESULT * from t2;
ERROR 42000: Incorrect usage/placement of 'SQL_BUFFER_RESULT'
create table t3 select a,b from t1 union all select a,b from t2;
insert into t3 select a,b from t1 union all select a,b from t2;
replace into t3 select a,b as c from t1 union all select a,b from t2;
drop table t1,t2,t3;
select * union select 1;
ERROR HY000: No tables used
select 1 as a,(select a union select a);
a	(select a union select a)
1	1
(select 1) union (select 2) order by 0;
ERROR 42S22: Unknown column '0' in 'order clause'
SELECT @a:=1 UNION SELECT @a:=@a+1;
@a:=1
1
2
Warnings:
Warning	1287	Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
Warning	1287	Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
(SELECT 1) UNION (SELECT 2) ORDER BY (SELECT a);
ERROR 42S22: Unknown column 'a' in 'field list'
(SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);
1	3
1	3
2	1
create table t1 (a int);
create table t2 (a int);
insert into t1 values (1),(2),(3),(4),(5);
insert into t2 values (11),(12),(13),(14),(15);
(select * from t1 limit 2) union (select * from t2 limit 3) limit 4;
a
1
2
11
12
(select * from t1 limit 2) union (select * from t2 limit 3);
a
1
2
11
12
13
(select * from t1 limit 2) union (select * from t2 limit 20,3);
a
1
2
set SQL_SELECT_LIMIT=2;
(select * from t1 limit 1) union (select * from t2 limit 3);
a
1
11
set SQL_SELECT_LIMIT=DEFAULT;
drop table t1,t2;
CREATE TABLE t1 (
cid smallint(5) unsigned NOT NULL default '0',
cv varchar(250) NOT NULL default '',
PRIMARY KEY  (cid),
UNIQUE KEY cv (cv)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 VALUES (8,'dummy');
CREATE TABLE t2 (
cid bigint(20) unsigned NOT NULL auto_increment,
cap varchar(255) NOT NULL default '',
PRIMARY KEY  (cid),
KEY cap (cap)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
CREATE TABLE t3 (
gid bigint(20) unsigned NOT NULL auto_increment,
gn varchar(255) NOT NULL default '',
must tinyint(4) default NULL,
PRIMARY KEY  (gid),
KEY gn (gn)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t3 VALUES (1,'V1',NULL);
CREATE TABLE t4 (
uid bigint(20) unsigned NOT NULL default '0',
gid bigint(20) unsigned default NULL,
rid bigint(20) unsigned default NULL,
cid bigint(20) unsigned default NULL,
UNIQUE KEY m (uid,gid,rid,cid),
KEY uid (uid),
KEY rid (rid),
KEY cid (cid),
KEY container (gid,rid,cid)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t4 VALUES (1,1,NULL,NULL);
CREATE TABLE t5 (
rid bigint(20) unsigned NOT NULL auto_increment,
rl varchar(255) NOT NULL default '',
PRIMARY KEY  (rid),
KEY rl (rl)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
CREATE TABLE t6 (
uid bigint(20) unsigned NOT NULL auto_increment,
un varchar(250) NOT NULL default '',
uc smallint(5) unsigned NOT NULL default '0',
PRIMARY KEY  (uid),
UNIQUE KEY nc (un,uc),
KEY un (un)
) ;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t6 VALUES (1,'test',8);
SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc  = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
uid	rl	g1	cid	gg
1	NULL	V1	NULL	1
SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc  = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
uid	rl	g1	cid	gg
(SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc  = t1.cid AND t1.cv = "dummy" AND t6.un = "test") UNION (SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc  = t1.cid AND t1.cv = "dummy" AND t6.un = "test");
uid	rl	g1	cid	gg
1	NULL	V1	NULL	1
drop table t1,t2,t3,t4,t5,t6;
CREATE TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
CREATE TABLE t2 (a int not null, b char (10) not null);
insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
create table t3 select a,b from t1 union select a,b from t2;
create table t4 (select a,b from t1) union (select a,b from t2) limit 2;
insert into  t4 select a,b from t1 union select a,b from t2;
insert into  t3 (select a,b from t1) union (select a,b from t2) limit 2;
select * from t3;
a	b
1	a
2	b
3	c
4	d
5	f
6	e
1	a
2	b
select * from t4;
a	b
1	a
2	b
1	a
2	b
3	c
4	d
5	f
6	e
drop table t1,t2,t3,t4;
create table t1 (a int);
insert into t1 values (1),(2),(3);
create table t2 (a int);
insert into t2 values (3),(4),(5);
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1) UNION all (SELECT * FROM t2)) q;
COUNT(*)
6
(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2) LIMIT 1;
a
1
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
6
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2)) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2) LIMIT 2;
a
1
3
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2)) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2);
a
1
3
4
5
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1) UNION all (SELECT * FROM t2 LIMIT 1)) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2 LIMIT 1);
a
1
2
3
3
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION SELECT * FROM t2) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION SELECT * FROM t2 LIMIT 1;
a
1
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION all SELECT * FROM t2 LIMIT 2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION all SELECT * FROM t2 LIMIT 2' at line 1
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION all SELECT * FROM t2) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all SELECT * FROM t2 LIMIT 2;
a
1
3
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
SELECT                     * FROM t1 UNION all SELECT * FROM t2) q;
COUNT(*)
6
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION all SELECT * FROM t2 LIMIT 2;
a
1
2
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
6
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
SELECT                     * FROM t1 UNION SELECT * FROM t2) q;
COUNT(*)
5
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2;
a
1
2
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
5
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
SELECT                     * FROM t1 UNION SELECT * FROM t2) q;
COUNT(*)
5
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 100;
a
1
2
3
4
5
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
5
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 100 UNION SELECT * FROM t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT * FROM t2' at line 1
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 100) UNION SELECT * FROM t2) q;
COUNT(*)
5
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 100) UNION SELECT * FROM t2;
a
1
2
3
4
5
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
5
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT * FROM t2' at line 1
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION SELECT * FROM t2) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION SELECT * FROM t2;
a
1
3
4
5
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2 LIMIT 2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT * FROM t2 LIMIT 2' at line 1
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 LIMIT 1) UNION SELECT * FROM t2) q;
COUNT(*)
4
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION SELECT * FROM t2 LIMIT 2;
a
1
3
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
4
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
SELECT                     * FROM t1 UNION SELECT * FROM t2) q;
COUNT(*)
5
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2,2;
a
3
4
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
5
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT SQL_CALC_FOUND_ROWS * FROM t1 limit 2,2 UNION SELECT * FROM t2;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT * FROM t2' at line 1
SELECT COUNT(*) FROM (
(SELECT                     * FROM t1 limit 2,2) UNION SELECT * FROM t2) q;
COUNT(*)
3
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 limit 2,2) UNION SELECT * FROM t2;
a
3
4
5
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
select found_rows();
found_rows()
3
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a desc LIMIT 1;
a
5
(SELECT * FROM t1 ORDER by a) UNION ALL (SELECT * FROM t2 ORDER BY a) ORDER BY A desc LIMIT 4;
a
5
4
3
3
(SELECT * FROM t1) UNION all (SELECT SQL_CALC_FOUND_ROWS * FROM t2) LIMIT 1;
ERROR 42000: Incorrect usage/placement of 'SQL_CALC_FOUND_ROWS'
create temporary table t1 select a from t1 union select a from t2;
drop temporary table t1;
create temporary table temp1 select a from t1 union select a from t2;
drop temporary table temp1;
create table t1 select a from t1 union select a from t2;
ERROR 42S01: Table 't1' already exists
select a from t1 union select a from t2 order by t2.a;
ERROR 42000: Table 't2' from one of the SELECTs cannot be used in global ORDER clause
drop table t1,t2;
select length(version()) > 1 as `*` UNION select 2;
*
1
2
create table t1 (a int);
insert into t1 values (0), (3), (1), (2);
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
explain (select * from t1) union (select * from t1) order by a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
2	UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	#	#	NULL
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using temporary; Using filesort
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `<union temporary>`.`a`
drop table t1;
create table t1 (a int not null primary key auto_increment, b int, key(b));
create table t2 (a int not null primary key auto_increment, b int);
insert into t1 (b) values (1),(2),(2),(3);
insert into t2 (b) values (10),(11),(12),(13);
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
explain (select * from t1 where a=1) union (select * from t2 where a=1);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	const	PRIMARY	PRIMARY	4	const	1	100.00	NULL
2	UNION	t2	NULL	const	PRIMARY	PRIMARY	4	const	1	100.00	NULL
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	NULL	NULL	Using temporary
Warnings:
Note	1003	/* select#1 */ select '1' AS `a`,'1' AS `b` from `test`.`t1` where true union /* select#2 */ select '1' AS `a`,'10' AS `b` from `test`.`t2` where true
explain format=tree (select * from t1 where a=5) union (select * from t2 where a=1);
EXPLAIN
-> Table scan on <union temporary>  (cost=2.50 rows=0)
    -> Union materialize with deduplication
        -> Zero rows (no matching row in const table)
        -> Rows fetched before execution

(select * from t1 where a=5) union (select * from t2 where a=1);
a	b
1	10
(select * from t1 where a=5 and a=6) union (select * from t2 where a=1);
a	b
1	10
(select t1.a,t1.b from t1,t2 where t1.a=5) union (select * from t2 where a=1);
a	b
1	10
(select * from t1 where a=1) union (select t1.a,t2.a from t1,t2 where t1.a=t2.a);
a	b
1	1
2	2
3	3
4	4
explain (select * from t1 where a=1 and b=10) union (select straight_join t1.a,t2.a from t1,t2 where t1.a=t2.a);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	#	NULL	Impossible WHERE noticed after reading const tables
2	UNION	t1	NULL	index	PRIMARY	b	5	NULL	#	100.00	Using index
2	UNION	t2	NULL	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	#	100.00	Using index
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	#	NULL	Using temporary
Warnings:
Note	1003	/* select#1 */ select '1' AS `a`,'1' AS `b` from `test`.`t1` where false union /* select#2 */ select straight_join `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where (`test`.`t2`.`a` = `test`.`t1`.`a`)
explain (select * from t1 where a=1) union (select * from t1 where b=1);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	const	PRIMARY	PRIMARY	4	const	#	#	NULL
2	UNION	t1	NULL	ref	b	b	5	const	#	#	Using index
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	#	#	Using temporary
Warnings:
Note	1003	/* select#1 */ select '1' AS `a`,'1' AS `b` from `test`.`t1` where true union /* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` = 1)
drop table t1,t2;
create table `groups` (id int not null auto_increment, primary key (id) ,user_name text );
create table users (id int not null auto_increment, primary key (id) ,group_name text );
create table t3 (id int not null auto_increment, primary key (id),user_id int,index user_idx (user_id),foreign key (user_id) references users(id),group_id int,index group_idx (group_id),foreign key (group_id) references `groups`(id) );
insert into `groups` (user_name) values ('Tester');
insert into users (group_name) values ('Group A');
insert into users (group_name) values ('Group B');
insert into t3 (user_id, group_id) values (1,1);
select 1 'is_in_group', a.user_name, c.group_name, b.id from `groups` a, t3 b, users c where a.id = b.user_id and b.group_id = c.id UNION  select 0 'is_in_group', a.user_name, c.group_name, null from `groups` a, users c;
is_in_group	user_name	group_name	id
1	Tester	Group A	1
0	Tester	Group A	NULL
0	Tester	Group B	NULL
drop table t3, users, `groups`;
create table t1 (mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test MEDIUMINT UNSIGNED NULL);
create table t2 (mat_id MEDIUMINT UNSIGNED NOT NULL, pla_id MEDIUMINT UNSIGNED NOT NULL);
insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4), (NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8), (NULL, 'i', 9);
insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id union SELECT 0, 0;
pla_id	matintnum
100	a
101	a
102	a
103	b
104	b
105	c
0	0
drop table t1, t2;
create table t1 SELECT "a" as a UNION select "aa" as a;
select * from t1;
a
a
aa
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(2) NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT 12 as a UNION select "aa" as a;
select * from t1;
a
12
aa
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(2) NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT 12 as a UNION select 12.2 as a;
select * from t1;
a
12.0
12.2
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` decimal(3,1) NOT NULL DEFAULT '0.0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t2 (it1 tinyint, it2 tinyint not null, i int not null, ib bigint, f float, d double, y year, da date, dt datetime, sc char(10), sv varchar(10), b blob, tx text);
insert into t2 values (NULL, 1, 3, 4, 1.5, 2.5, 1972, '1972-10-22', '1972-10-22 11:50', 'testc', 'testv', 'tetetetetest', 'teeeeeeeeeeeest');
create table t1 SELECT it2 from t2 UNION select it1 from t2;
select * from t1;
it2
1
NULL
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `it2` tinyint(4) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT it2 from t2 UNION select i from t2;
select * from t1;
it2
1
3
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `it2` int(11) NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT i from t2 UNION select f from t2;
select * from t1;
i
3
1.5
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `i` double DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT f from t2 UNION select d from t2;
select * from t1;
f
1.5
2.5
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `f` double DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT ib from t2 UNION select f from t2;
select * from t1;
ib
4
1.5
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `ib` double DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT ib from t2 UNION select d from t2;
select * from t1;
ib
4
2.5
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `ib` double DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT f from t2 UNION select y from t2;
select * from t1;
f
1.5
1972
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `f` float DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT f from t2 UNION select da from t2;
select * from t1;
f
1.5
1972-10-22
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `f` varchar(12) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT y from t2 UNION select da from t2;
select * from t1;
y
1972
1972-10-22
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `y` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT y from t2 UNION select dt from t2;
select * from t1;
y
1972
1972-10-22 11:50:00
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `y` varchar(19) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT da from t2 UNION select dt from t2;
select * from t1;
da
1972-10-22 00:00:00
1972-10-22 11:50:00
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `da` datetime DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT dt from t2 UNION select trim(sc) from t2;
select trim(dt) from t1;
trim(dt)
1972-10-22 11:50:00
testc
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `dt` varchar(19) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT dt from t2 UNION select sv from t2;
select * from t1;
dt
1972-10-22 11:50:00
testv
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `dt` varchar(19) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT sc from t2 UNION select sv from t2;
select * from t1;
sc
testc
testv
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `sc` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT dt from t2 UNION select b from t2;
select * from t1;
dt
1972-10-22 11:50:00
tetetetetest
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `dt` blob
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT sv from t2 UNION select b from t2;
select * from t1;
sv
testv
tetetetetest
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `sv` blob
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT i from t2 UNION select d from t2 UNION select b from t2;
select * from t1;
i
3
2.5
tetetetetest
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `i` blob
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT sv from t2 UNION select tx from t2;
select * from t1;
sv
testv
teeeeeeeeeeeest
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `sv` mediumtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 SELECT b from t2 UNION select tx from t2;
select * from t1;
b
tetetetetest
teeeeeeeeeeeest
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `b` mediumblob
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1,t2;
create table t1 select 1 union select -1;
select * from t1;
1
1
-1
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `1` bigint(2) NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 select _latin1"test" union select _latin2"testt" ;
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'UNION'
create table t1 select _latin2"test" union select _latin2"testt" ;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `test` varchar(5) CHARACTER SET latin2 NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 (s char(200));
insert into t1 values (repeat("1",200));
create table t2 select * from t1;
insert into t2 select * from t1;
insert into t1 select * from t2;
insert into t2 select * from t1;
insert into t1 select * from t2;
insert into t2 select * from t1;
set local tmp_table_size=1024;
select count(*) from (select * from t1 union all select * from t2 order by 1) b;
count(*)
21
select count(*) from t1;
count(*)
8
select count(*) from t2;
count(*)
13
drop table t1,t2;
set local tmp_table_size=default;
create table t1 (a int, index (a), b int);
insert t1 values (1,1),(2,2),(3,3),(4,4),(5,5);
insert t1 select a+1, a+b from t1;
insert t1 select a+1, a+b from t1;
insert t1 select a+1, a+b from t1;
insert t1 select a+1, a+b from t1;
insert t1 select a+1, a+b from t1;
FLUSH STATUS;
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	0
select count(*) from t1 where a=7;
count(*)
26
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	0
select count(*) from t1 where b=13;
count(*)
10
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	1
select count(*) from t1 where b=13 union select count(*) from t1 where a=7;
count(*)
10
26
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	2
select count(*) from t1 where a=7 union select count(*) from t1 where b=13;
count(*)
26
10
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	3
flush status;
select a from t1 where b not in (1,2,3) union select a from t1 where b not in (4,5,6);
a
4
5
3
6
7
8
9
10
1
2
show status like 'Slow_queries';
Variable_name	Value
Slow_queries	1
drop table t1;
create table t1 (col1 tinyint unsigned, col2 tinyint unsigned);
insert into t1 values (1,2),(3,4),(5,6),(7,8),(9,10);
select col1 n from t1 union select col2 n from t1 order by n;
n
1
2
3
4
5
6
7
8
9
10
alter table t1 add index myindex (col2);
select col1 n from t1 union select col2 n from t1 order by n;
n
1
2
3
4
5
6
7
8
9
10
drop  table t1;
create table t1 (i int);
insert into t1 values (1);
select * from t1 UNION select * from t1;
i
1
select * from t1 UNION ALL select * from t1;
i
1
1
select * from t1 UNION select * from t1 UNION ALL select * from t1;
i
1
1
drop table t1;
select 1 as a union all select 1 union all select 2 union select 1 union all select 2;
a
1
2
2
set sql_select_limit=1;
select 1 union select 2;
1
1
(select 1) union (select 2);
1
1
(select 1) union (select 2) union (select 3) limit 2;
1
1
2
set sql_select_limit=default;
create table t1 (a int);
insert into t1 values (100), (1);
create table t2 (a int);
insert into t2 values (100);
select a from t1 union select a from t2 order by a;
a
1
100
SET SQL_SELECT_LIMIT=1;
select a from t1 union select a from t2 order by a;
a
1
drop table t1, t2;
set sql_select_limit=default;
CREATE TABLE t1 (i int(11) default NULL,c char(1) default NULL,KEY i (i));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
CREATE TABLE t2 (i int(11) default NULL,c char(1) default NULL,KEY i (i));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
explain (select * from t1) union (select * from t2) order by not_existing_column;
ERROR 42S22: Unknown column 'not_existing_column' in 'order clause'
drop table t1, t2;
CREATE TABLE t1 (uid int(1));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 SELECT 150;
SELECT 'a' UNION SELECT uid FROM t1;
a
a
150
drop table t1;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
CREATE TABLE t1 ( ID1 int(10) unsigned NOT NULL DEFAULT '0' , ID2 datetime NOT NULL DEFAULT '0000-00-00 00:00:00' , DATA1 varchar(10) , DATA2 double(5,4) , DATA3 datetime , PRIMARY KEY (ID1,ID2));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
CREATE TABLE t2 ( ID int(3) unsigned NOT NULL DEFAULT '0' , DATA1 timestamp DEFAULT '0000-00-00 00:00:00' , PRIMARY KEY (ID));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
(SELECT * FROM t1 AS PARTITIONED, t2 AS
PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1);
ID1	ID2	DATA1	DATA2	DATA3	ID	DATA1
drop table t1,t2;
SET sql_mode = default;
create table t1 (a ENUM('Yes', 'No') NOT NULL);
create table t2 (a ENUM('aaa', 'bbb') NOT NULL);
insert into t1 values ('No');
insert into t2 values ('bbb');
create table t3 (a SET('Yes', 'No') NOT NULL);
create table t4 (a SET('aaa', 'bbb') NOT NULL);
insert into t3 values (1);
insert into t4 values (3);
select "1" as a union select a from t1;
a
1
No
select a as a from t1 union select "1";
a
No
1
select a as a from t2 union select a from t1;
a
bbb
No
select "1" as a union select a from t3;
a
1
Yes
select a as a from t3 union select "1";
a
Yes
1
select a as a from t4 union select a from t3;
a
aaa,bbb
Yes
select a as a from t1 union select a from t4;
a
No
aaa,bbb
drop table t1,t2,t3,t4;
set names latin1;
create table t1 as
(select _latin1'test') union
(select _latin1'TEST') union
(select _latin1'TeST');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `test` varchar(4) CHARACTER SET latin1 NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select count(*) from t1;
count(*)
1
drop table t1;
create table t1 as
(select _latin1'test' collate latin1_bin) union
(select _latin1'TEST') union
(select _latin1'TeST');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `_latin1'test' collate latin1_bin` varchar(4) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select count(*) from t1;
count(*)
3
drop table t1;
create table t1 as
(select _latin1'test') union
(select _latin1'TEST' collate latin1_bin) union
(select _latin1'TeST');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `test` varchar(4) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select count(*) from t1;
count(*)
3
drop table t1;
create table t1 as
(select _latin1'test') union
(select _latin1'TEST') union
(select _latin1'TeST' collate latin1_bin);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `test` varchar(4) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select count(*) from t1;
count(*)
3
drop table t1;
create table t2 (
a char character set latin1 collate latin1_swedish_ci,
b char character set latin1 collate latin1_german1_ci);
create table t1 as
(select a from t2) union
(select b from t2);
ERROR HY000: Illegal mix of collations for operation 'UNION'
create table t1 as
(select a collate latin1_german1_ci from t2) union
(select b from t2);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a collate latin1_german1_ci` varchar(1) CHARACTER SET latin1 COLLATE latin1_german1_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 as
(select a from t2) union
(select b collate latin1_german1_ci from t2);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(1) CHARACTER SET latin1 COLLATE latin1_german1_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
create table t1 as
(select a from t2) union
(select b from t2) union
(select 'c' collate latin1_german1_ci from t2);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(1) CHARACTER SET latin1 COLLATE latin1_german1_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
drop table t2;
create table t1(a1 int, f1 char(10));
create table t2
select f2,a1 from (select a1, CAST('2004-12-31' AS DATE) f2 from t1) a
union
select f2,a1 from (select a1, CAST('2004-12-31' AS DATE) f2 from t1) a
order by f2, a1;
show columns from t2;
Field	Type	Null	Key	Default	Extra
f2	date	YES		NULL	
a1	int(11)	YES		NULL	
drop table t1, t2;
create table t1 (f1 int);
create table t2 (f1 int, f2 int ,f3 date);
create table t3 (f1 int, f2 char(10));
create table t4
(
select t2.f3 as sdate
from t1
left outer join t2 on (t1.f1 = t2.f1)
inner join t3 on (t2.f2 = t3.f1)
order by t1.f1, t3.f1, t2.f3
)
union
(
select cast('2004-12-31' as date) as sdate
from t1
left outer join t2 on (t1.f1 = t2.f1)
inner join t3 on (t2.f2 = t3.f1)
group by t1.f1
order by t1.f1, t3.f1, t2.f3
)
order by sdate;
show columns from t4;
Field	Type	Null	Key	Default	Extra
sdate	date	YES		NULL	
drop table t1, t2, t3, t4;
create table t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
select * from ((select * from t1 limit 1)) a;
a	b
1	a
select * from ((select * from t1 limit 1) union (select * from t1 limit 1)) a;
a	b
1	a
select * from ((select * from t1 limit 1) union (select * from t1 limit 1) union (select * from t1 limit 1)) a;
a	b
1	a
select * from ((((select * from t1))) union (select * from t1) union (select * from t1)) a;
a	b
1	a
2	b
3	c
select * from ((select * from t1) union (((select * from t1))) union (select * from t1)) a;
a	b
1	a
2	b
3	c
drop table t1;
set @val:=6;
select concat('value is: ', @val) union select 'some text';
concat('value is: ', @val)
value is: 6
some text
select concat(_latin1'a', _ascii'b' collate ascii_bin);
concat(_latin1'a', _ascii'b' collate ascii_bin)
ab
create table t1 (foo varchar(100)) collate ascii_bin;
insert into t1 (foo) values ("foo");
select foo from t1 union select 'bar' as foo from dual;
foo
foo
bar
drop table t1;
CREATE TABLE t1 (
a ENUM('<EFBFBD>','<EFBFBD>','<EFBFBD>') character set utf8 not null default '<EFBFBD>',
b ENUM("one", "two") character set utf8,
c ENUM("one", "two")
);
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` enum('<EFBFBD>','<EFBFBD>','<EFBFBD>') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '<EFBFBD>',
  `b` enum('one','two') CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `c` enum('one','two') DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
insert into t1 values ('<EFBFBD>', 'one', 'one'), ('<EFBFBD>', 'two', 'one'), ('<EFBFBD>', NULL, NULL);
create table t2 select NULL union select a from t1;
show columns from t2;
Field	Type	Null	Key	Default	Extra
NULL	enum('<EFBFBD>','<EFBFBD>','<EFBFBD>')	YES		NULL	
drop table t2;
create table t2 select a from t1 union select NULL;
show columns from t2;
Field	Type	Null	Key	Default	Extra
a	enum('<EFBFBD>','<EFBFBD>','<EFBFBD>')	YES		NULL	
drop table t2;
create table t2 select a from t1 union select a from t1;
show columns from t2;
Field	Type	Null	Key	Default	Extra
a	varchar(1)	NO			
drop table t2;
create table t2 select a from t1 union select c from t1;
drop table t2;
create table t2 select a from t1 union select b from t1;
show columns from t2;
Field	Type	Null	Key	Default	Extra
a	varchar(3)	YES		NULL	
drop table t2, t1;
create table t1 (f1 decimal(60,25), f2 decimal(60,25));
insert into t1 values (0.0,0.0);
select f1 from t1 union all select f2 from t1;
f1
0.0000000000000000000000000
0.0000000000000000000000000
select 'XXXXXXXXXXXXXXXXXXXX' as description, f1 from t1
union all
select 'YYYYYYYYYYYYYYYYYYYY' as description, f2 from t1;
description	f1
XXXXXXXXXXXXXXXXXXXX	0.0000000000000000000000000
YYYYYYYYYYYYYYYYYYYY	0.0000000000000000000000000
drop table t1;
create table t1 (f1 decimal(60,24), f2 decimal(60,24));
insert into t1 values (0.0,0.0);
select f1 from t1 union all select f2 from t1;
f1
0.000000000000000000000000
0.000000000000000000000000
select 'XXXXXXXXXXXXXXXXXXXX' as description, f1 from t1
union all
select 'YYYYYYYYYYYYYYYYYYYY' as description, f2 from t1;
description	f1
XXXXXXXXXXXXXXXXXXXX	0.000000000000000000000000
YYYYYYYYYYYYYYYYYYYY	0.000000000000000000000000
drop table t1;
create table t1 (a varchar(5));
create table t2 select * from t1 union select 'abcdefghijkl';
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` varchar(12) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select row_format from information_schema.TABLES where table_schema="test" and table_name="t2";
ROW_FORMAT
Dynamic
alter table t2 ROW_FORMAT=fixed;
ERROR HY000: Table storage engine 'InnoDB' does not support the create option 'ROW_TYPE'
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` varchar(12) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1,t2;
CREATE TABLE t1 (a mediumtext);
CREATE TABLE t2 (b varchar(20));
INSERT INTO t1 VALUES ('a'),('b');
SELECT left(a,100000000) FROM t1 UNION  SELECT b FROM t2;
left(a,100000000)
a
b
create table t3 SELECT left(a,100000000) FROM t1 UNION  SELECT b FROM t2;
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `left(a,100000000)` longtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop tables t1,t2,t3;
CREATE TABLE t1 (a longtext);
CREATE TABLE t2 (b varchar(20));
INSERT INTO t1 VALUES ('a'),('b');
SELECT left(a,100000000) FROM t1 UNION  SELECT b FROM t2;
left(a,100000000)
a
b
create table t3 SELECT left(a,100000000) FROM t1 UNION  SELECT b FROM t2;
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `left(a,100000000)` longtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop tables t1,t2,t3;
SELECT @tmp_max:= @@global.max_allowed_packet;
@tmp_max:= @@global.max_allowed_packet
67108864
Warnings:
Warning	1287	Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
SET @@global.max_allowed_packet=25000000;
Warnings:
Warning	1292	Truncated incorrect max_allowed_packet value: '25000000'
CREATE TABLE t1 (a mediumtext);
CREATE TABLE t2 (b varchar(20));
INSERT INTO t1 VALUES ('a');
CREATE TABLE t3 SELECT REPEAT(a,20000000) AS a FROM t1 UNION SELECT b FROM t2;
SHOW CREATE TABLE t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` longtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLES t1,t3;
CREATE TABLE t1 (a tinytext);
INSERT INTO t1 VALUES ('a');
CREATE TABLE t3 SELECT REPEAT(a,2) AS a FROM t1 UNION SELECT b FROM t2;
SHOW CREATE TABLE t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` varchar(510) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLES t1,t3;
CREATE TABLE t1 (a mediumtext);
INSERT INTO t1 VALUES ('a');
CREATE TABLE t3 SELECT REPEAT(a,2) AS a FROM t1 UNION SELECT b FROM t2;
SHOW CREATE TABLE t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` longtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLES t1,t3;
CREATE TABLE t1 (a tinyblob);
INSERT INTO t1 VALUES ('a');
CREATE TABLE t3 SELECT REPEAT(a,2) AS a FROM t1 UNION SELECT b FROM t2;
SHOW CREATE TABLE t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` varbinary(510) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLES t1,t2,t3;
SET @@global.max_allowed_packet:= @tmp_max;
create table t1 ( id int not null auto_increment, primary key (id), col1 int);
insert into t1 (col1) values (2),(3),(4),(5),(6);
select 99 union all select id from t1 order by 1;
99
1
2
3
4
5
99
select id from t1 union all select 99 order by 1;
id
1
2
3
4
5
99
drop table t1;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create table t1(f1 char(1), f2 char(5), f3 binary(1), f4 binary(5), f5 timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', f6 varchar(1) character set utf8 collate utf8_general_ci, f7 text);
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
Warning	3778	'utf8_general_ci' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
create table t2 as select *, f6 as f8 from t1 union select *, f7 from t1;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `f1` char(1) DEFAULT NULL,
  `f2` char(5) DEFAULT NULL,
  `f3` binary(1) DEFAULT NULL,
  `f4` binary(5) DEFAULT NULL,
  `f5` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `f6` varchar(1) CHARACTER SET utf8 DEFAULT NULL,
  `f7` mediumtext,
  `f8` mediumtext
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1, t2;
SET sql_mode = default;
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1)) union
(select avg(1)) union (select avg(1)) union (select avg(1));
avg(1)
1.0000
select _utf8'12' union select _latin1'12345';
12
12
12345
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (3),(1),(2),(4),(1);
SELECT a FROM (SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a) AS test;
a
1
2
3
4
SELECT a FROM (SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY c) AS test;
ERROR 42S22: Unknown column 'c' in 'order clause'
DROP TABLE t1;
(select 1 into @var) union (select 1);
ERROR HY000: Incorrect usage of UNION and INTO
(select 1) union (select 1 into @var);
select @var;
@var
1
(select 2) union (select 1 into @var);
ERROR 42000: Result consisted of more than one row
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (10), (20);
CREATE TABLE t2 (b int);
INSERT INTO t2 VALUES (10), (50), (50);
SELECT a,1 FROM t1 
UNION
SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP
ORDER BY a;
a	1
NULL	3
10	1
20	1
50	2
SELECT a,1 FROM t1 
UNION
SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP
ORDER BY a DESC;
a	1
50	2
20	1
10	1
NULL	3
SELECT a,1 FROM t1 
UNION
SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP
ORDER BY a ASC LIMIT 3;
a	1
NULL	3
10	1
20	1
SELECT a,1 FROM t1 
UNION ALL 
SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP
ORDER BY a DESC;
a	1
50	2
20	1
10	1
10	1
NULL	3
SELECT a,1 FROM t1
UNION 
(SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP ORDER BY a);
ERROR 42S22: Unknown column 'a' in 'order clause'
SELECT a,1 FROM t1
UNION ALL
SELECT b, COUNT(*) FROM t2 GROUP BY b WITH ROLLUP ORDER BY a
UNION
SELECT 1,1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION
SELECT 1,1' at line 4
DROP TABLE t1,t2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1), (2), (3);
CREATE TABLE t2 SELECT * FROM (SELECT NULL) a UNION SELECT a FROM t1;
DESC t2;
Field	Type	Null	Key	Default	Extra
NULL	int(11)	YES		NULL	
CREATE TABLE t3 SELECT a FROM t1 UNION SELECT * FROM (SELECT NULL) a;
DESC t3;
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
CREATE TABLE t4 SELECT NULL;
DESC t4;
Field	Type	Null	Key	Default	Extra
NULL	binary(0)	YES		NULL	
CREATE TABLE t5 SELECT NULL UNION SELECT NULL;
DESC t5;
Field	Type	Null	Key	Default	Extra
NULL	binary(0)	YES		NULL	
CREATE TABLE t6 
SELECT * FROM (SELECT * FROM (SELECT NULL)a) b UNION SELECT a FROM t1;
DESC t6;
Field	Type	Null	Key	Default	Extra
NULL	int(11)	YES		NULL	
DROP TABLE t1, t2, t3, t4, t5, t6;
CREATE TABLE t1 (f FLOAT(9,6));
Warnings:
Warning	1681	Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
CREATE TABLE t2 AS SELECT f FROM t1 UNION SELECT f FROM t1;
Warnings:
Warning	1681	Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
SHOW FIELDS FROM t2;
Field	Type	Null	Key	Default	Extra
f	float(9,6)	YES		NULL	
DROP TABLE t1, t2;
CREATE TABLE t1(d DOUBLE(9,6));
Warnings:
Warning	1681	Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
CREATE TABLE t2 AS SELECT d FROM t1 UNION SELECT d FROM t1;
Warnings:
Warning	1681	Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
SHOW FIELDS FROM t2;
Field	Type	Null	Key	Default	Extra
d	double(9,6)	YES		NULL	
DROP TABLE t1, t2;
CREATE TABLE t1(a INT);
EXPLAIN
SELECT a FROM t1
UNION
SELECT a FROM t1
ORDER BY a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	1	100.00	NULL
2	UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	1	100.00	NULL
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	NULL	NULL	Using temporary; Using filesort
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `<union temporary>`.`a`
DROP TABLE t1;
End of 5.0 tests
#
# Bug#32858: Error: "Incorrect usage of UNION and INTO" does not take 
# subselects into account
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
# Tests fix in parser rule select_derived_union.
SELECT a INTO @v FROM (
SELECT a FROM t1
UNION
SELECT a FROM t1
) alias;
SELECT a INTO OUTFILE 'union.out.file' FROM (
SELECT a FROM t1
UNION
SELECT a FROM t1 WHERE 0
) alias;
SELECT a INTO DUMPFILE 'union.out.file2' FROM (
SELECT a FROM t1
UNION
SELECT a FROM t1 WHERE 0
) alias;
SELECT a FROM t1 UNION SELECT a INTO @v FROM t1;
SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file5' FROM t1;
SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file6' FROM t1;
SELECT a INTO @v FROM t1 UNION SELECT a FROM t1;
ERROR HY000: Incorrect usage of UNION and INTO
SELECT a INTO OUTFILE 'union.out.file7' FROM t1 UNION SELECT a FROM t1;
ERROR HY000: Incorrect usage of UNION and INTO
SELECT a INTO DUMPFILE 'union.out.file8' FROM t1 UNION SELECT a FROM t1;
ERROR HY000: Incorrect usage of UNION and INTO
# Tests fix in parser rule query_expression_body.
SELECT ( SELECT a UNION SELECT a ) INTO @v FROM t1;
SELECT ( SELECT a UNION SELECT a ) INTO OUTFILE  'union.out.file3' FROM t1;
SELECT ( SELECT a UNION SELECT a ) INTO DUMPFILE 'union.out.file4' FROM t1;
DROP TABLE t1;
# 
# Bug #49734: Crash on EXPLAIN UNION ... ORDER BY 
#   <any non-const-function>
# 
CREATE TABLE t1 (a VARCHAR(10), FULLTEXT KEY a (a));
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (1),(2);
# Should not crash
EXPLAIN
SELECT * FROM t1 UNION SELECT * FROM t1 ORDER BY a + 12;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
2	UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	NULL	NULL	Using temporary; Using filesort
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by (`<union temporary>`.`a` + 12)
# Should not crash
SELECT * FROM t1 UNION SELECT * FROM t1 ORDER BY a + 12;
a
1
2
# Should not crash
EXPLAIN
SELECT * FROM t1 UNION SELECT * FROM t1
ORDER BY MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE);
ERROR HY000: The used table type doesn't support FULLTEXT indexes
# Should not crash
WITH cte AS (
SELECT * FROM t1 UNION SELECT * FROM t1
ORDER BY MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE)
) SELECT * FROM cte;
ERROR HY000: The used table type doesn't support FULLTEXT indexes
# Should not crash
SELECT * FROM t1 UNION SELECT * FROM t1
ORDER BY MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE);
ERROR HY000: The used table type doesn't support FULLTEXT indexes
# Should not crash
(SELECT * FROM t1) UNION (SELECT * FROM t1)
ORDER BY MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE);
ERROR HY000: The used table type doesn't support FULLTEXT indexes
# Should not crash
EXPLAIN
SELECT * FROM t1 UNION SELECT * FROM t1
ORDER BY (SELECT a FROM t2 WHERE b = 12);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
2	UNION	t1	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	NULL	NULL	Using temporary; Using filesort
3	DEPENDENT SUBQUERY	t2	NULL	ALL	NULL	NULL	NULL	NULL	2	50.00	Using where
Warnings:
Note	1276	Field or reference 'a' of SELECT #3 was resolved in SELECT #1
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by (/* select#3 */ select `<union temporary>`.`a` from `test`.`t2` where (`test`.`t2`.`b` = 12))
# Should not crash
SELECT * FROM t1 UNION SELECT * FROM t1
ORDER BY (SELECT a FROM t2 WHERE b = 12);
# Should not crash
SELECT * FROM t2 UNION SELECT * FROM t2
ORDER BY (SELECT * FROM t1 WHERE MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE));
b
1
2
DROP TABLE t1,t2;
#
# Bug#11765255 58201:
# VALGRIND/CRASH WHEN ORDERING BY MULTIPLE AGGREGATE FUNCTIONS
#
select 1 as foo
union
select 2
union
select 3
union
select 4
order by max(42) + max(1) + max(1) + max(1) + max(1) + max(1)
;
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
prepare stmt1 from 'select 1 as foo
union
select 2
union
select 3
union
select 4
order by max(42) + max(1) + max(1) + max(1) + max(1) + max(1)
';
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
select 1 as foo
union
select 2
union
select 3
union
(select 4)
order by max(42) + max(1) + max(1) + max(1) + max(1) + max(1)
;
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
prepare stmt1 from 'select 1 as foo
union
select 2
union
select 3
union
(select 4)
order by max(42) + max(1) + max(1) + max(1) + max(1) + max(1)
';
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
End of 5.1 tests
#
# Bug#57986 ORDER BY clause is not used after a UNION, 
#           if embedded in a SELECT
#
CREATE TABLE t1 (c1 VARCHAR(10) NOT NULL, c2 INT NOT NULL);
CREATE TABLE t2 (c1 VARCHAR(10) NOT NULL, c2 INT NOT NULL);
INSERT INTO t1 (c1, c2) VALUES ('t1a', 1), ('t1a', 2), ('t1a', 3), ('t1b', 2), ('t1b', 1);
INSERT INTO t2 (c1, c2) VALUES ('t2a', 1), ('t2a', 2), ('t2a', 3), ('t2b', 2), ('t2b', 1);
SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY c2, c1;
c1	c2
t1a	1
t1b	1
t2a	1
t2b	1
t1a	2
t1b	2
t2a	2
t2b	2
t1a	3
t2a	3
SELECT * FROM t1 UNION (SELECT * FROM t2) ORDER BY c2, c1;
c1	c2
t1a	1
t1b	1
t2a	1
t2b	1
t1a	2
t1b	2
t2a	2
t2b	2
t1a	3
t2a	3
SELECT * FROM t1 UNION (SELECT * FROM t2 ORDER BY c2, c1);
c1	c2
t1a	1
t1a	2
t1a	3
t1b	2
t1b	1
t2a	1
t2a	2
t2a	3
t2b	2
t2b	1
SELECT c1, c2 FROM (
SELECT c1, c2 FROM t1
UNION
(SELECT c1, c2 FROM t2)
ORDER BY c2, c1
) AS res;
c1	c2
t1a	1
t1b	1
t2a	1
t2b	1
t1a	2
t1b	2
t2a	2
t2b	2
t1a	3
t2a	3
SELECT c1, c2 FROM (
SELECT c1, c2 FROM t1
UNION
(SELECT c1, c2 FROM t2)
ORDER BY c2 DESC, c1 LIMIT 1
) AS res;
c1	c2
t1a	3
SELECT c1, c2 FROM (
SELECT c1, c2 FROM t1
UNION
(SELECT c1, c2 FROM t2 ORDER BY c2 DESC, c1 LIMIT 1)
) AS res;
c1	c2
t1a	1
t1a	2
t1a	3
t1b	2
t1b	1
t2a	3
SELECT c1, c2 FROM (
SELECT c1, c2 FROM t1
UNION
SELECT c1, c2 FROM t2 
ORDER BY c2 DESC, c1 DESC LIMIT 1
) AS res;
c1	c2
t2a	3
SELECT c1, c2 FROM (
(
(SELECT c1, c2 FROM t1)
UNION
(SELECT c1, c2 FROM t2)
)
ORDER BY c2 DESC, c1 ASC LIMIT 1
) AS res;
c1	c2
t1a	3
DROP TABLE t1, t2;
#
# Bug #58970 Problem Subquery (without referencing a table) 
#            and Order By
#
SELECT(SELECT 0 AS a UNION SELECT 1 AS a ORDER BY a ASC  LIMIT 1) AS dev;
dev
0
SELECT(SELECT 0 AS a UNION SELECT 1 AS a ORDER BY a DESC LIMIT 1) AS dev;
dev
1
SELECT(SELECT 0 AS a FROM dual UNION SELECT 1 AS a FROM dual ORDER BY a ASC  LIMIT 1) AS dev;
dev
0
SELECT(SELECT 0 AS a FROM dual UNION SELECT 1 AS a FROM dual ORDER BY a DESC LIMIT 1) AS dev;
dev
1
SELECT(SELECT 1 AS a ORDER BY a) AS dev;
dev
1
SELECT(SELECT 1 AS a LIMIT 1) AS dev;
dev
1
SELECT(SELECT 1 AS a FROM dual ORDER BY a DESC LIMIT 1) AS dev;
dev
1
#
# Bug#11886060: SELECT .. UNION SELECT .. ORDER BY IS WRONGLY PARSED
#
create table t1(b int) engine=innodb;
All 3 should be parsed without errors.
select b as z from t1 union select b from t1 order by z;
z
select b as z from t1 union select b from t1 order by (select z);
z
select b as z from t1 union (select b from t1) order by (select z);
z
drop table t1;
#
# WL#1763 Avoid creating temporary table in UNION ALL
#
EXPLAIN SELECT 1 UNION ALL SELECT 1 LIMIT 1 OFFSET 1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
2	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` union all /* select#2 */ select 1 AS `1` limit 1,1
# Bug #17579498 CHANGES IN DATATYPE OF THE RESULT QUERY IN UNION.
CREATE TABLE t1 (a TIME);
CREATE TABLE t2 (b DATETIME);
CREATE TABLE t3
SELECT a FROM t1 UNION ALL SELECT b FROM t2;
SELECT column_name, column_type
FROM information_schema.columns
WHERE TABLE_NAME='t3';
COLUMN_NAME	COLUMN_TYPE
a	datetime
DROP TABLE t1, t2, t3;
# Bug #17602922 RESULT DIFFERENCES IN UNION QUERIES WITH IN
# (SUBQUERY-UNION ALL)
CREATE TABLE t1 (a VARCHAR(1));
INSERT INTO t1 VALUES (NULL);
INSERT INTO t1 VALUES (NULL);
INSERT INTO t1 VALUES ('j');
INSERT INTO t1 VALUES ('k');
INSERT INTO t1 VALUES ('r');
INSERT INTO t1 VALUES ('r');
INSERT INTO t1 VALUES ('h');
SELECT a FROM t1 WHERE a IN (SELECT 'r' FROM t1 UNION ALL SELECT 'j');
a
j
r
r
CREATE TABLE t2
SELECT a FROM t1 WHERE a IN (SELECT 'r' FROM t1 UNION ALL SELECT 'j');
SELECT * FROM t2;
a
j
r
r
DROP TABLE t1, t2;
# Bug #17580869 FOUND_ROWS() VALUE DO NOT MATCH WITH
# UNION-LIMIT QUERIES
CREATE TABLE t1 (a INT PRIMARY KEY);
CREATE TABLE t2 (a INT PRIMARY KEY);
INSERT INTO t2 VALUES (1);
EXPLAIN FORMAT=tree SELECT a, SUM(a) FROM t2 UNION ALL SELECT a, MIN(a) FROM t1 ;
EXPLAIN
-> Append
    -> Stream results
        -> Aggregate: sum(t2.a)
            -> Index scan on t2 using PRIMARY  (cost=0.35 rows=1)
    -> Stream results
        -> Zero input rows (No matching min/max row), aggregated into one output row

SELECT a, SUM(a) FROM t2 UNION ALL SELECT a, MIN(a) FROM t1 ;
a	SUM(a)
1	1
NULL	NULL
SELECT FOUND_ROWS();
FOUND_ROWS()
2
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
DROP TABLE t1, t2;
# Bug #17669551 CRASH/ASSERT AT SELECT_CREATE::PREPARE2 AT
# SQL_INSERT.CC
CREATE TABLE t1 (a INT);
CREATE TABLE t2 SELECT a, a FROM t1 UNION ALL SELECT a, a FROM t1;
ERROR 42S21: Duplicate column name 'a'
DROP TABLE t1;
# Bug #17694956 RESULT DIFFERENCES IN UNION ALL QUERIES WITH LIMIT
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
(SELECT a FROM t1 ORDER BY a LIMIT 0) UNION ALL SELECT a FROM t1;
a
1
DROP TABLE t1;
# Bug #17708480 FOUND_ROWS() VALUE DO NOT MATCH WITH UNION ALL QUERIES
CREATE TABLE t1 (a INT) ENGINE=MEMORY;
CREATE TABLE t2 (a INT) ENGINE=MEMORY;
INSERT INTO t2 VALUES (1);
SELECT COUNT(*) FROM (
SELECT                     * FROM t2 UNION ALL SELECT * FROM t1) q;
COUNT(*)
1
SELECT SQL_CALC_FOUND_ROWS * FROM t2 UNION ALL SELECT * FROM t1;
a
1
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
SELECT FOUND_ROWS();
FOUND_ROWS()
1
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
SELECT COUNT(*) FROM (
SELECT                     * FROM t1 UNION ALL SELECT * FROM t2) q;
COUNT(*)
1
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION ALL SELECT * FROM t2;
a
1
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
SELECT FOUND_ROWS();
FOUND_ROWS()
1
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
DROP TABLE t1, t2;
# End of WL1763 tests
# Bug#18503515 UNION with set function in ORDER BY should be rejected
# UNIONed queries are non-aggregated:
SELECT 1 AS foo
UNION
SELECT 2
ORDER BY MAX(1);
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
prepare stmt from 'SELECT 1 AS foo
UNION
SELECT 2
ORDER BY MAX(1)';
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
SELECT MAX(1) AS foo
UNION
SELECT MAX(2)
ORDER BY foo;
foo
1
2
SELECT MAX(1) AS foo
UNION
SELECT MAX(2)
ORDER BY 1 DESC;
foo
2
1
# UNIONed queries are aggregated:
SELECT MAX(1) AS foo
UNION
SELECT MAX(2)
ORDER BY MAX(1);
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
CREATE TABLE t1(a INTEGER);
INSERT INTO t1 VALUES (1), (2);
# Subquery, ORDER BY contains outer reference
SELECT (SELECT 1 AS foo
UNION
SELECT 2
ORDER BY a) AS x
FROM t1;
ERROR 21000: Subquery returns more than 1 row
# Subquery, ORDER BY contains outer reference
SELECT (SELECT 1 AS foo
UNION
SELECT 2
ORDER BY t1.a) AS x
FROM t1;
ERROR 42000: Table 't1' from one of the SELECTs cannot be used in global ORDER clause
# Subquery, ORDER BY contains set function with outer reference
SELECT (SELECT 1 AS foo
UNION
SELECT 2
ORDER BY COUNT(a)) AS x
FROM t1;
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
# Subquery, ORDER BY contains set function with outer reference
SELECT (SELECT 1 AS foo
UNION
SELECT 2
ORDER BY COUNT(t1.a)) AS x
FROM t1;
ERROR 42000: Table 't1' from one of the SELECTs cannot be used in global ORDER clause
# Subquery, ORDER BY contains set function
SELECT (SELECT 1 AS foo
UNION
SELECT 2
ORDER BY COUNT(*)) AS x
FROM t1;
ERROR HY000: Expression #1 of ORDER BY contains aggregate function and applies to a UNION
CREATE TABLE t2(a INTEGER, b INTEGER);
INSERT INTO t2 VALUES (1,10), (2,20);
SELECT MAX(a) FROM t2 GROUP BY b
UNION
SELECT MAX(a) FROM t2 GROUP BY b
ORDER BY max(a);
ERROR 42S22: Unknown column 'a' in 'order clause'
DROP TABLE t1, t2;
#
# Bug #19471564 WL#6737:IN-CONSISTENT DATA-TYPE FOR GEOMETRY TYPES WHILE
# PROJECTING DERIVED TBL.
#
CREATE TABLE t1(g GEOMETRY, p POINT, l LINESTRING);
INSERT INTO t1 (p, l) VALUES (ST_GeomFromText('POINT(1 1)'),
ST_GeomFromText('LINESTRING(0 0,1 1,2 2)'));
SELECT ST_AsText(a) FROM (SELECT p AS a FROM t1 UNION SELECT l FROM t1) t;
ST_AsText(a)
POINT(1 1)
LINESTRING(0 0,1 1,2 2)
CREATE TABLE t2 ENGINE=InnoDB SELECT a FROM
(SELECT p AS a FROM t1 UNION SELECT l FROM t1) t;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1, t2;
CREATE TABLE geometries (
g GEOMETRY,
pt POINT,
ls LINESTRING,
py POLYGON,
mpt MULTIPOINT,
mls MULTILINESTRING,
mpy MULTIPOLYGON,
gc GEOMETRYCOLLECTION);
INSERT INTO geometries VALUES (
ST_GeomFromText('POLYGON((0 0, 9 0, 9 9, 0 9, 0 0), (2 2, 4 2, 4 4, 2 2))'),
ST_GeomFromText('POINT(0 0)'),
ST_GeomFromText('LINESTRING(0 0, 10 10)'),
ST_GeomFromText('POLYGON((0 0, 9 0, 9 9, 0 9, 0 0), (2 2, 4 2, 4 4, 2 2))'),
ST_GeomFromText('MULTIPOINT(0 0, 1 1, 2 2)'),
ST_GeomFromText('MULTILINESTRING((0 0, 10 10), (10 0, 0 10))'),
ST_GeomFromText('MULTIPOLYGON(((0 0, 9 0, 9 9, 0 0)), '
                               '((2 2, 3 2, 3 3, 2 2)))'),
ST_GeomFromText('GEOMETRYCOLLECTION(POINT(1 1), LINESTRING(2 2, 3 3), '
                                     'POLYGON((0 0, 9 0, 9 9, 0 9, 0 0)))'));
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT g FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` point DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT pt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` linestring DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT ls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` polygon DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT py FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` multipoint DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT mpt FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` multilinestring DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT mls FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` multipolygon DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT mpy FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT g AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT pt AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT ls AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT py AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpt AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mls AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT mpy AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geometry DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
CREATE TABLE t1 ENGINE=InnoDB SELECT a FROM
(SELECT gc AS a FROM geometries UNION SELECT gc FROM geometries) t;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` geomcollection DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
DROP TABLE geometries;
# 
# Bug#20456178 ASSERTION FAILED: 
#     (ENUM_SET_TYPELIB && GET_REAL_TYPE(ITEM) == MYSQL_TYPE_NULL)
CREATE TABLE t1(a INT) engine=innodb;
CREATE TABLE t2(a SET('a'))engine=innodb;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1);
SELECT a FROM (SELECT a FROM t2) t1
UNION ALL
SELECT 1 FROM t1;
a
a
1
DROP TABLE t1, t2;
#
# Bug #21156155 UNION GEOMETRY TYPE: UNITIALIZED VALUE IN
# ITEM_TYPE_HOLDER::JOIN_TYPES
#
SELECT NULL UNION SELECT POINT(1,1);
NULL
NULL


<EFBFBD>?<EFBFBD>?
#
# Bug#22602381 FOUND_ROWS() IS NOT WORKING AS EXPECTED WITHOUT
#              SQL_CALC_FOUND_ROWS
#
CREATE TABLE t1(c1 INT);
INSERT INTO t1 VALUES(1),(2),(3);
(SELECT c1 FROM t1) UNION ALL
(SELECT c1 FROM t1) LIMIT 2;
c1
1
2
SELECT FOUND_ROWS();
FOUND_ROWS()
2
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
(SELECT SQL_CALC_FOUND_ROWS c1 FROM t1) UNION ALL
(SELECT c1 FROM t1) LIMIT 2;
c1
1
2
Warnings:
Warning	1287	SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
SELECT FOUND_ROWS();
FOUND_ROWS()
6
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
(SELECT c1 FROM t1 LIMIT 1) UNION ALL
(SELECT c1 FROM t1 LIMIT 3) LIMIT 2;
c1
1
1
SELECT FOUND_ROWS();
FOUND_ROWS()
2
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
(SELECT c1 FROM t1 LIMIT 1) UNION ALL
(SELECT c1 FROM t1 LIMIT 1) LIMIT 3;
c1
1
1
SELECT FOUND_ROWS();
FOUND_ROWS()
2
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
(SELECT c1 FROM t1 LIMIT 3) UNION ALL
(SELECT c1 FROM t1 LIMIT 3) LIMIT 1 OFFSET 4;
c1
2
SELECT FOUND_ROWS();
FOUND_ROWS()
5
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
(SELECT c1 FROM t1 LIMIT 1) UNION ALL
(SELECT c1 FROM t1 LIMIT 1) LIMIT 1 OFFSET 2;
c1
SELECT FOUND_ROWS();
FOUND_ROWS()
2
Warnings:
Warning	1287	FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
DROP TABLE t1;
#End of test for Bug#22602381
# INSERT SELECT using UNION ALL:
# UNION should create no tmp table if not at the top level.
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 LIKE t1;
FLUSH STATUS;
SELECT * FROM t1 UNION ALL SELECT * FROM t1;
a
1
2
1
2
SHOW STATUS LIKE "handler_write";
Variable_name	Value
Handler_write	0
FLUSH STATUS;
INSERT INTO t2
SELECT * FROM t1 UNION ALL SELECT * FROM t1;
SHOW STATUS LIKE "handler_write";
Variable_name	Value
Handler_write	8
SELECT * FROM t2;
a
1
2
1
2
DELETE FROM t2;
FLUSH STATUS;
INSERT INTO t2
SELECT * FROM (SELECT * FROM t1 UNION ALL SELECT * FROM t1) AS dt;
SHOW STATUS LIKE "handler_write";
Variable_name	Value
Handler_write	8
SELECT * FROM t2;
a
1
2
1
2
DROP TABLE t1,t2;
#
# Bug#24808970 CREATED_TMP_TABLES STATISTIC IS WRONG
#
FLUSH STATUS;
SELECT 1 UNION ALL SELECT 2;
1
1
2
SHOW STATUS LIKE 'Created_tmp_%tables';
Variable_name	Value
Created_tmp_disk_tables	0
Created_tmp_tables	0
FLUSH STATUS;
SELECT 1 UNION DISTINCT SELECT 2;
1
1
2
variable_name	tweaked_value
Created_tmp_disk_tables	0
Created_tmp_tables	1
#
# Bug#11747567: INTEGER CONSTANTS CASTED TO BIGINTS BY UNIONS
#
CREATE TABLE t1(
a tinyint(4) DEFAULT NULL,
b int(11) DEFAULT NULL,
c bigint(20) DEFAULT NULL
);
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
CREATE VIEW v1 AS SELECT t1.a AS a, t1.b AS b,t1.c AS c, 1 AS
`1`, 1 AS `My_exp_1`, 1 AS `My_exp_1_1` FROM t1 UNION SELECT -(1) AS `-1`,
-(1) AS `-1`, -(1) AS `-1`, -(1) AS `-1`, -(1) AS `-1`, -(1) AS `-1`;
CREATE VIEW v2 AS SELECT 1 AS `1`, 1 AS `My_exp_1`, 1 AS `My_exp_1_1`,
-(1) AS `-1`, -(1) AS `My_exp_-1`, -(1) AS `My_exp_1_-1`;
CREATE VIEW v3 AS SELECT t1.a AS a, t1.b AS b, t1.c AS c FROM t1;
DESCRIBE v1;
Field	Type	Null	Key	Default	Extra
a	bigint(4)	YES		NULL	
b	bigint(11)	YES		NULL	
c	bigint(20)	YES		NULL	
1	bigint(2)	NO		0	
My_exp_1	bigint(2)	NO		0	
My_exp_1_1	bigint(2)	NO		0	
DESCRIBE v2;
Field	Type	Null	Key	Default	Extra
1	int(1)	NO		0	
My_exp_1	int(1)	NO		0	
My_exp_1_1	int(1)	NO		0	
-1	int(2)	NO		0	
My_exp_-1	int(2)	NO		0	
My_exp_1_-1	int(2)	NO		0	
DESCRIBE v3;
Field	Type	Null	Key	Default	Extra
a	tinyint(4)	YES		NULL	
b	int(11)	YES		NULL	
c	bigint(20)	YES		NULL	
DROP TABLE t1;
DROP VIEW v1,v2,v3;
# End of test for Bug#11747567
#
# Bug #27068222 CREATE TABLE USING SELECT WITH UNION
#               FAILS FOR DATE COLUMN
#
CREATE TABLE `t1` (`date` date NOT NULL);
INSERT INTO t1 VALUES ('2017-03-02'), ('2017-06-22');
CREATE TABLE IF NOT EXISTS t2 AS
SELECT * FROM t1
UNION
SELECT * FROM t1;
DESC t2;
Field	Type	Null	Key	Default	Extra
date	date	NO		NULL	
SELECT * FROM t2;
date
2017-03-02
2017-06-22
DROP TABLE t1, t2;
CREATE TABLE t1 (
i1 INT NOT NULL,
i2 INT NOT NULL DEFAULT '1234',
# non-specified nullability => i3 is nullable
i3 INT,
i4 INT DEFAULT NULL,
i5 INT DEFAULT '5678',
d1 date NOT NULL,
d2 date NOT NULL DEFAULT '2018-01-25',
d3 date,
d4 date DEFAULT NULL,
d5 date DEFAULT '2017-11-14',
g1 geometry NOT NULL
);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `i1` int(11) NOT NULL,
  `i2` int(11) NOT NULL DEFAULT '1234',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT '5678',
  `d1` date NOT NULL,
  `d2` date NOT NULL DEFAULT '2018-01-25',
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT '2017-11-14',
  `g1` geometry NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
SET SQL_MODE='';
SELECT @@SQL_MODE;
@@SQL_MODE

CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1;
# we see that with CREATE SELECT (no UNION), defaults are inherited.
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL,
  `i2` int(11) NOT NULL DEFAULT '1234',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT '5678',
  `d1` date NOT NULL,
  `d2` date NOT NULL DEFAULT '2018-01-25',
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT '2017-11-14',
  `g1` geometry NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TEMPORARY TABLE t2;
CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1
UNION
SELECT * FROM t1;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL DEFAULT '0',
  `i2` int(11) NOT NULL DEFAULT '0',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT NULL,
  `d1` date NOT NULL DEFAULT '0000-00-00',
  `d2` date NOT NULL DEFAULT '0000-00-00',
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT NULL,
  `g1` geometry NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TEMPORARY TABLE t2;
CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1
UNION ALL
SELECT * FROM t1;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL DEFAULT '0',
  `i2` int(11) NOT NULL DEFAULT '0',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT NULL,
  `d1` date NOT NULL DEFAULT '0000-00-00',
  `d2` date NOT NULL DEFAULT '0000-00-00',
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT NULL,
  `g1` geometry NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# With UNION and UNION ALL, defaults are not inherited; every
# column gets, as default, NULL (if nullable) or 0 (if not
# nullable). Exception: if strict mode and a date type,
# 0000-00-00 isn't given as default
INSERT INTO t2 VALUES();
SELECT * FROM t2;
i1	i2	i3	i4	i5	d1	d2	d3	d4	d5	g1
0	0	NULL	NULL	NULL	0000-00-00	0000-00-00	NULL	NULL	NULL	
DROP TEMPORARY TABLE t2;
SET SQL_MODE=DEFAULT;
SELECT @@SQL_MODE;
@@SQL_MODE
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1;
# we see that with CREATE SELECT (no UNION), defaults are inherited.
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL,
  `i2` int(11) NOT NULL DEFAULT '1234',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT '5678',
  `d1` date NOT NULL,
  `d2` date NOT NULL DEFAULT '2018-01-25',
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT '2017-11-14',
  `g1` geometry NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TEMPORARY TABLE t2;
CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1
UNION
SELECT * FROM t1;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL DEFAULT '0',
  `i2` int(11) NOT NULL DEFAULT '0',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT NULL,
  `d1` date NOT NULL,
  `d2` date NOT NULL,
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT NULL,
  `g1` geometry NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TEMPORARY TABLE t2;
CREATE TEMPORARY TABLE t2 AS
SELECT * FROM t1
UNION ALL
SELECT * FROM t1;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TEMPORARY TABLE `t2` (
  `i1` int(11) NOT NULL DEFAULT '0',
  `i2` int(11) NOT NULL DEFAULT '0',
  `i3` int(11) DEFAULT NULL,
  `i4` int(11) DEFAULT NULL,
  `i5` int(11) DEFAULT NULL,
  `d1` date NOT NULL,
  `d2` date NOT NULL,
  `d3` date DEFAULT NULL,
  `d4` date DEFAULT NULL,
  `d5` date DEFAULT NULL,
  `g1` geometry NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# With UNION and UNION ALL, defaults are not inherited; every
# column gets, as default, NULL (if nullable) or 0 (if not
# nullable). Exception: if strict mode and a date type,
# 0000-00-00 isn't given as default
SELECT * FROM t2;
i1	i2	i3	i4	i5	d1	d2	d3	d4	d5	g1
DROP TEMPORARY TABLE t2;
SET SQL_MODE=DEFAULT;
DROP TABLE t1;
#
# Bug #27903792 [MYSQL 8.0 GA DEBUG BUILD] ASSERTION `DATA_TYPE() ==
# MYSQL_TYPE_GEOMETRY' FAILED
#
SELECT ST_GEOMFROMTEXT('POINT(0 0)')
UNION
SELECT * FROM (SELECT NULL) AS a;
#
# Bug#28237675: ASSERTION IN UNION QUERY WHEN MIXING CHARACTER SETS
#
CREATE TABLE t(a VARCHAR(10) CHARSET ASCII);
SELECT _utf8mb4 'a' UNION SELECT a FROM t;
a
a
SELECT _utf8mb4 0xC3A6 UNION SELECT a FROM t;
ERROR HY000: Illegal mix of collations (utf8mb4_0900_ai_ci,COERCIBLE) and (ascii_general_ci,IMPLICIT) for operation 'UNION'
DROP TABLE t;
#
# Bug#27849293 INVALID WRITE IN SYSSCHEMA.PR_DIAGNOSTICS
#
# Note that this bug can only be seen when running with valgrind.
PREPARE stmt FROM "SELECT 'foo' UNION ALL SELECT ?";
SET @param = CONVERT('bar' USING utf8mb3);
Warnings:
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
EXECUTE stmt USING @param;
foo
foo
bar
SET @param = CONVERT('BAR' USING utf8mb4);
EXECUTE stmt USING @param;
foo
foo
BAR
SET @param = CONVERT('foo' USING ucs2);
EXECUTE stmt USING @param;
foo
foo
foo
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM 'SELECT "foo", "foo2" UNION SELECT CONVERT("bar" USING utf8mb3), "bar2" UNION SELECT "foobar", CONVERT("foobar2" USING utf8mb3)';
Warnings:
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
EXECUTE stmt;
foo	foo2
foo	foo2
bar	bar2
foobar	foobar2
DEALLOCATE PREPARE stmt;
CREATE PROCEDURE p1() SELECT "foo", "foo2" UNION SELECT CONVERT("bar" USING utf8mb3), "bar2" UNION SELECT "foobar", CONVERT("foobar2" USING utf8mb3);
Warnings:
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
CALL p1();
foo	foo2
foo	foo2
bar	bar2
foobar	foobar2
DROP PROCEDURE p1;
#
# Verify that non-nullable columns are properly treated as nullable
# during implicit aggregation, even in UNIONs, even when involving
# views. The non-view case is tested by the test for bug #17580869,
# above.
#
CREATE TABLE t1 (a INT PRIMARY KEY);
CREATE TABLE t2 (a INT PRIMARY KEY);
INSERT INTO t2 VALUES (1);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT a, a, SUM(a) FROM t2 UNION ALL SELECT a, a+0, MIN(a) FROM v1;
a	a	SUM(a)
1	1	1
NULL	NULL	NULL
DROP TABLE t1, t2;
DROP VIEW v1;
#
# Bug #29645319: WL#13000: SIG 6 AT AGGREGATOR_DISTINCT::SETUP | SQL/ITEM_SUM.CC
#
# Tests that when executing a UNION query during optimization, lex->current_select
# is properly restored.
#
CREATE TABLE t1 (f1 VARCHAR(1));
INSERT INTO t1 VALUES ('t'),('a');
SELECT COUNT(DISTINCT f1) FROM t1 WHERE (
SELECT MAX(f1) FROM t1 WHERE f1 NOT IN ( SELECT 5 UNION SELECT 5 )
) IS NOT NULL;
COUNT(DISTINCT f1)
2
DROP TABLE t1;
#
# Bug #29687893: WL#13000: SIG 6 AT HANDLER::START_PSI_BATCH_MODE() AT SQL/HANDLER.CC
#
# Verify that performance schema batch mode is properly disabled even in non-materialized
# UNIONs.
#
CREATE TABLE t1 (f1 varchar(1));
CREATE INDEX i1 ON t1 (f1);
CREATE TABLE t2 (f1 varchar(1));
INSERT INTO t1 VALUES ('d');
INSERT INTO t2 VALUES ('d');
ANALYZE TABLE t1, t2;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
test.t2	analyze	status	OK
SELECT t1.f1 FROM t1 LEFT JOIN t2 ON EXISTS ( SELECT * FROM t1, t2 )
UNION ALL
SELECT t1.f1 FROM t1;
f1
d
d
FLUSH TABLES;
DROP TABLE t1, t2;
#
# Bug#22292995 UNION ALL ... LIMIT 1 EVALUATES TOO MANY ROWS IN 5.5/6 AND TWICE MORE IN 5.7
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1);
INSERT INTO t1 SELECT a+1 FROM t1;
INSERT INTO t1 SELECT a+1 FROM t1;
INSERT INTO t1 SELECT a+1 FROM t1;
INSERT INTO t1 SELECT a+1 FROM t1;
INSERT INTO t1 SELECT a+1 FROM t1;
SELECT COUNT(*) FROM t1;
COUNT(*)
32
FLUSH STATUS;
SELECT * FROM t1 LIMIT 1;
a
1
SHOW STATUS LIKE "HANDLER_READ%";
Variable_name	Value
Handler_read_first	1
Handler_read_key	1
Handler_read_last	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	1
FLUSH STATUS;
SELECT * FROM t1 UNION ALL SELECT * FROM t1 LIMIT 1;
a
1
SHOW STATUS LIKE "HANDLER_READ%";
Variable_name	Value
Handler_read_first	1
Handler_read_key	1
Handler_read_last	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	1
FLUSH STATUS;
SELECT * FROM t1 UNION DISTINCT SELECT * FROM t1 LIMIT 1;
a
1
SHOW STATUS LIKE "HANDLER_READ%";
Variable_name	Value
Handler_read_first	1
Handler_read_key	1
Handler_read_last	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	2
EXPLAIN FORMAT=TREE ( SELECT *, 'a' FROM t1 LIMIT 10 )
UNION ALL ( SELECT *, 'b' FROM t1 LIMIT 10 ) LIMIT 3;
EXPLAIN
-> Limit: 3 row(s)
    -> Append
        -> Stream results
            -> Limit: 10 row(s)
                -> Table scan on t1  (cost=3.45 rows=32)
        -> Stream results
            -> Limit: 10 row(s)
                -> Table scan on t1  (cost=3.45 rows=32)

FLUSH STATUS;
( SELECT *, 'a' FROM t1 LIMIT 10 )
UNION ALL ( SELECT *, 'b' FROM t1 LIMIT 10 ) LIMIT 3;
a	a
1	a
2	a
2	a
SHOW STATUS LIKE "HANDLER_READ%";
Variable_name	Value
Handler_read_first	1
Handler_read_key	1
Handler_read_last	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	3
DROP TABLE t1;