You can‘t specify target table ‘Person‘ for update in FROM clause

背景：

原因：简言之，就是mysql不支持在一个表同时实现查找和删除。

解决方案：中间表，查到之后再select一次。


//错误代码delete from Person
where id not in
(select MIN(Id) as idfrom Person group by Email
)//正确代码delete from Person
where id not in
(select t.id from   (select MIN(Id) as idfrom Person group by Email) t
)

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