SET global default_storage_engine=MERGE; SET session default_storage_engine=MERGE; # Test for warnings on column creation CREATE TABLE t1 (y YEAR(4) NOT NULL); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `y` year(4) NOT NULL ) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci DROP TABLE t1; CREATE TABLE t1 (y YEAR(-4) NOT NULL); 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 '-4) NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR(0) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(1) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(2) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(5) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(10240) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(-1) NOT NULL); 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 '-1) NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR(-4294967296) NOT NULL); 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 '-4294967296) NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR(-4294967295) NOT NULL); 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 '-4294967295) NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR(NULL) NOT NULL); 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 'NULL) NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR('') NOT NULL); 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 ''') NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR('a') NOT NULL); 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 ''a') NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR('-a') NOT NULL); 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 ''-a') NOT NULL)' at line 1 CREATE TABLE t1 (y YEAR(4294967296) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. CREATE TABLE t1 (y YEAR(4294967295) NOT NULL); ERROR HY000: Supports only YEAR or YEAR(4) column. # Test for default column width value CREATE TABLE t1 (y YEAR NOT NULL); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `y` year(4) NOT NULL ) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci DROP TABLE t1; # # Check various ALTER TABLE operations on YEAR(2) type # CREATE TABLE t1 (i INT NOT NULL); # Try to create new YEAR(2) column with ALTER TABLE ALTER TABLE t1 ADD COLUMN y YEAR(2) NOT NULL; ERROR HY000: Supports only YEAR or YEAR(4) column. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL ) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci # Try to convert YEAR(4) column to YEAR(2) with ALTER TABLE ALTER TABLE t1 MODIFY COLUMN y YEAR(2) NOT NULL; ERROR HY000: Supports only YEAR or YEAR(4) column. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL ) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ALTER TABLE t1 MODIFY COLUMN i YEAR(2) NOT NULL; ERROR HY000: Supports only YEAR or YEAR(4) column. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL ) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ALTER TABLE t1 MODIFY COLUMN i INT NOT NULL; DROP TABLE t1; SET @@global.default_storage_engine = InnoDB; SET @@session.default_storage_engine = InnoDB; #