删除 Select Inner Join 查询结果答案

【问题标题】：Delete a Select Inner Join Query result删除 Select Inner Join 查询结果
【发布时间】：2021-12-26 16:47:24
【问题描述】：

SELECT yturl from ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip;

我想删除exp的查询结果这个查询结果是：

yturl	ip	id
eY5WRONGXDI	197.XX.XX.XXX	1

虽然我想从 ytpointadder 中删除它。我试过了：

DELETE from ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip;

【问题讨论】：

标签： mysql sql inner-join

【解决方案1】：

在部分查询中，它应该返回一列您可能需要使用括号

试试这个

DELETE FROM ytpointadder
WHERE yturl IN
( 
SELECT a.yturl from  ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip)

【讨论】：

谢谢你，但认为这行不通
出现的错误信息是什么？

【解决方案2】：

您不能在 FROM 子句中为更新（删除）指定相同的目标表。所以你必须使用另一个外部查询。

试试：

DELETE FROM ytpointadder
WHERE yturl IN  ( SELECT t.yturl FROM (SELECT a.yturl, a.ip from ytpointadder a
                                     JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
                                     Group by a.ip 
                                     ) as t 
                 ) ;

【讨论】：