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CREATE TABLE t1 (a INT) ENGINE=InnoDB; INSERT INTO t1 VALUES(347),(33101),(123),(45),(6); ALTER TABLE t1 ADD PRIMARY KEY(a); ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, LOCK=NONE; ERROR 0A000: LOCK=NONE is not supported. Reason: Adding an auto-increment column requires a lock. Try LOCK=SHARED. ALTER TABLE t1 ADD id INT AUTO_INCREMENT; ERROR 42000: Incorrect table definition; there can be only one auto column and it must be defined as a key ALTER TABLE t1 ADD id INT AUTO_INCREMENT, ADD INDEX(a, id); ERROR 42000: Incorrect table definition; there can be only one auto column and it must be defined as a key ALTER TABLE t1 ADD id INT NOT NULL, ADD INDEX(id, a); SELECT * FROM t1; a id 6 0 45 0 123 0 347 0 33101 0 SET AUTO_INCREMENT_INCREMENT = 5, AUTO_INCREMENT_OFFSET = 30; ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, DROP COLUMN id, AUTO_INCREMENT = 42, ALGORITHM=COPY; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=70 DEFAULT CHARSET=latin1 BEGIN; INSERT INTO t1 VALUES(7,0); SELECT * FROM t1; a id 6 45 45 50 123 55 347 60 33101 65 7 70 ROLLBACK; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=75 DEFAULT CHARSET=latin1 ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, DROP COLUMN id, AUTO_INCREMENT = 42, LOCK=NONE; ERROR 0A000: LOCK=NONE is not supported. Reason: Adding an auto-increment column requires a lock. Try LOCK=SHARED. ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, DROP COLUMN id, AUTO_INCREMENT = 42, ALGORITHM=INPLACE; SELECT * FROM t1; a id 6 45 45 50 123 55 347 60 33101 65 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=70 DEFAULT CHARSET=latin1 INSERT INTO t1 SET a=123; INSERT INTO t1 VALUES(-123,-45); ALTER TABLE t1 AUTO_INCREMENT = 75; INSERT INTO t1 SET a=123; SELECT * FROM t1; a id -123 -45 6 45 45 50 123 55 347 60 33101 65 123 70 123 75 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=80 DEFAULT CHARSET=latin1 DROP TABLE t1; CREATE TABLE t1 (a INT) ENGINE=InnoDB; INSERT INTO t1 VALUES(347),(33101),(123),(45),(6); ALTER TABLE t1 ADD PRIMARY KEY(a); ALTER TABLE t1 ADD id INT NOT NULL, ADD INDEX(id, a); SELECT * FROM t1; a id 6 0 45 0 123 0 347 0 33101 0 ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, DROP COLUMN id, AUTO_INCREMENT = 42, ALGORITHM=INPLACE; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=70 DEFAULT CHARSET=latin1 BEGIN; INSERT INTO t1 VALUES(7,0); SELECT * FROM t1; a id 6 45 45 50 123 55 347 60 33101 65 7 70 ROLLBACK; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=75 DEFAULT CHARSET=latin1 ALTER TABLE t1 DROP PRIMARY KEY, ADD id INT AUTO_INCREMENT PRIMARY KEY, DROP COLUMN id, AUTO_INCREMENT = 42, ALGORITHM=COPY; SELECT * FROM t1; a id 6 45 45 50 123 55 347 60 33101 65 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=70 DEFAULT CHARSET=latin1 INSERT INTO t1 SET a=123; INSERT INTO t1 VALUES(-123,-45); ALTER TABLE t1 AUTO_INCREMENT = 75; INSERT INTO t1 SET a=123; SELECT * FROM t1; a id -123 -45 6 45 45 50 123 55 347 60 33101 65 123 70 123 75 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `id` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`), KEY `id` (`id`,`a`) ) ENGINE=InnoDB AUTO_INCREMENT=80 DEFAULT CHARSET=latin1 DROP TABLE t1;