将自动增量列添加到现有表中，而无需扩展和重新导入

Posted 2021-02-26

How to add an auto-incremented column to an existing table without ex- and reimporting.

alter table t1, change id id int (11) DEFAULT '0' NOT NULL, drop primary key;
ALTER TABLE table ADD id2 INT UNSIGNED NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (id2);
alter table t1, change id2 id2 int (10)  NULL, drop primary key;
alter table t1, change id id int (11)UNSIGNED  DEFAULT '0' NOT NULL AUTO_INCREMENT, add primary key(id);