You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.1 KiB
57 lines
1.1 KiB
drop table if exists t1;
|
|
CREATE TABLE t1 (
|
|
a char(5) NOT NULL,
|
|
b char(4) NOT NULL,
|
|
KEY (a),
|
|
KEY (b)
|
|
) charset utf8mb4;
|
|
INSERT INTO t1 VALUES ('A','B'),('b','A'),('C','c'),('D','E'),('a','a');
|
|
select * from t1,t1 as t2;
|
|
a b a b
|
|
A B A B
|
|
A B C c
|
|
A B D E
|
|
A B a a
|
|
A B b A
|
|
C c A B
|
|
C c C c
|
|
C c D E
|
|
C c a a
|
|
C c b A
|
|
D E A B
|
|
D E C c
|
|
D E D E
|
|
D E a a
|
|
D E b A
|
|
a a A B
|
|
a a C c
|
|
a a D E
|
|
a a a a
|
|
a a b A
|
|
b A A B
|
|
b A C c
|
|
b A D E
|
|
b A a a
|
|
b A b A
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
|
|
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 NULL ALL a NULL NULL NULL 5 100.00 NULL
|
|
1 SIMPLE t2 NULL ref b b 16 test.t1.a 1 100.00 Using index condition
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t1` `t2` where (`test`.`t1`.`a` = `test`.`t2`.`b`)
|
|
select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
|
|
a b a b
|
|
A B a a
|
|
A B b A
|
|
C c C c
|
|
a a a a
|
|
a a b A
|
|
b A A B
|
|
select * from t1 where a='a';
|
|
a b
|
|
A B
|
|
a a
|
|
drop table t1;
|
|
|