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

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

含義:不能在同一表中查詢的資料作為同一表的更新資料。

注意:這個問題只出現於mysql,mssql和oracle不會出現此問題。

delete from people 
where peopleid in (select peopleid from people group by peopleid having count(peopleid)>1)
and rowid not in (select MIN(rowid) from people group by peopleid having count(peopleid)
>1)

修改後程式碼:

delete from people 
where peopleId  in (SELECT a.peopleid FROM
(select  peopleId  from people  group  by  peopleId   having  count(peopleId) > 1) a)
and rowid not in (SELECT b.rowid FROM
(select MIN(rowid) rowid from people  group by peopleId  having count(peopleId )>1) b)

查詢資料結果集中再套一層 

PS:感謝Cap_ZZ   https://blog.csdn.net/qq_38481999/article/details/80916034#commentBox