Mysql 抛出错误

发布于 2024-10-02 07:08:26 字数 180 浏览 3 评论 0原文

DELETE FROM mytable WHERE id IN (SELECT id FROM mytable where roll=1)

我有一个表mytable。我的上述查询抛出错误。

您无法在 FROM 子句中指定要更新的目标表“mytable”

DELETE FROM mytable WHERE id IN (SELECT id FROM mytable where roll=1)

I have a table mytable. My above query is throwing an error.

You can't specify target table 'mytable' for update in FROM clause

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仄言 2024-10-09 07:08:26

来自 MySQL 文档

目前,您无法在子查询中从表中删除并从同一个表中进行选择。

幸运的是,您不需要子查询。就这样做:

DELETE FROM mytable WHERE roll=1

启动起来更短、更清晰。

From the MySQL documentation:

Currently, you cannot delete from a table and select from the same table in a subquery.

Fortunately, you don't need the subquery. Just do:

DELETE FROM mytable WHERE roll=1

It's much shorter and clearer to boot.

夏末染殇 2024-10-09 07:08:26

你为什么不这样做呢?

DELETE FROM mytable WHERE roll=1

Why don't you just do this?

DELETE FROM mytable WHERE roll=1
如痴如狂 2024-10-09 07:08:26

你为什么不直接写呢

DELETE FROM mytable WHERE roll=1


发生该错误的原因是,当上级查询修改同一个表时,MySql 不喜欢从子查询中的表中获取数据。

Why don't you just write

DELETE FROM mytable WHERE roll=1

?
The error occurs because MySql doesn't like it to fetch form a table in a subquery when the superior query modifies the same table.

绝不放开 2024-10-09 07:08:26

为什么不简单地:

DELETE FROM mytable WHERE roll=1

Why not simply:

DELETE FROM mytable WHERE roll=1
鱼窥荷 2024-10-09 07:08:26

你为什么使用子查询?你可以这样写:

DELETE FROM mytable WHERE where roll=1;

Why are you using subquery? You can write it this way:

DELETE FROM mytable WHERE where roll=1;
萌辣 2024-10-09 07:08:26

此帖子解释了为什么您不能执行此操作。

在这个例子中,你可以使用:

DELETE FROM mytable WHERE roll=1

This thread explains why you can't do this.

And in this example, you can just use:

DELETE FROM mytable WHERE roll=1
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