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Mysql子查询的更新

2009-05-22 16:13:03| 分类： PHP标记 | 标签： |字号大中小订阅

有两张表，一张是管理员信息表Admin_user，一张是临时表tmp_Admin_User。当临时表中的用户名和管理员信息表中的用户名相同时，要把临时表中ErrorType字段设置为1。

通常的写法是：

Update `tmp_Admin_User` Set `ErrorType`=1 Where `login_name` in (Select A.`login_name` from `tmp_Admin_User` as A Inner Join `Admin_User` as B On A.`login_name`=B.`login_name`)

但是MySql会报错：#1093 - You can't specify target table 'tmp_admin_user' for update in FROM clause

可以使用的写法应该是：

Update `tmp_Admin_User` as C,(select A.`login_name` from `tmp_admin_user` as A Inner Join `admin_user` as B On A.`login_name`=B.`login_name`) as D set `ErrorType`=1 Where C.`login_name` = D.`login_name`

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