Question

我不知道这句话有什么问题，但每当我运行这个时我总是会收到错误

这是我的sql：

DELETE FROM tbl_usersinfo
WHERE users_lname IN
(SELECT users_lname FROM tbl_usersinfo WHERE users_lname = 'asd')

这是我的错误：

＃1093 - 您无法在FROM子句中为更新指定目标表'tbl_usersinfo'

Answer 1

注意，

(SELECT users_lname FROM tbl_usersinfo WHERE users_lname = 'asd')

等于

users_lname='asd'

所以，sql可能是

DELETE FROM tbl_usersinfo WHERE users_lname = 'asd'

Answer 2

您无法指定要删除的目标表。

首先创建临时表，然后在查询中同时使用临时表

CREATE TABLE IF NOT EXISTS table2 AS (SELECT * FROM tbl_usersinfo)

DELETE FROM tbl_usersinfo
WHERE users_lname IN
(SELECT users_lname FROM table2 WHERE users_lname = 'asd')

Sample Demo here

Answer 3

试

DELETE FROM tbl_usersinfo
WHERE users_lname IN
(select * from (SELECT users_lname FROM tbl_usersinfo WHERE users_lname = 'asd') as t)

子查询删除语句不起作用

3 个答案: