mysql - 关于参照完整性规则的 MySQL 删除表

Question

我想删除tableA，同时删除所有tableB匹配的行tableA.A_ID = tableB.A_ID

目前我有一个外键设置为CASCADE删除和更新设置TableB为tableB.A_ID.

Answer 1

通过以下方式暂时关闭约束

SET SQL_SAFE_UPDATES = 0;

DELETE FROM tableB b WHERE EXISTS ( SELECT * FROM tableA a WHERE a.A_ID = b.A_ID )

DELETE FROM tableA;

SET SQL_SAFE_UPDATES = 1;