使用mysql进行delete from xx in(子查询) 操作时，若子查询的 FROM ...

mysql> delete from user_goods where rec_id in (select b.rec_id from user_goods as ug inner join goods as g on ug.goods_id=g.goods_id where b.expired_time<1351612800);

ERROR 1093 (HY000): You can’t specify target table ‘user_goods’ for update in FROM clause

针对“同一张表”这个限制，可以通过增加别名的方式就可以避免了。如：

delete from user_goods where rec_id in (select * from (select b.rec_id from user_goods as ug inner join goods as g on ug.goods_id=g.goods_id where b.expired_time<1351612800) as tmp_result);

网上有人说，子查询里面不能有where条件，LZ专门试了一下，并没有这个限制！

delete from user_goods where rec_id in (select * from (select b.rec_id from user_goods as ug inner join goods as g on ug.goods_id=g.goods_id where b.expired_time<1351612800) as tmp_result where 1);

依然可以执行。

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