用下面的語句就報語法出錯：

delete from tab_record where recordid not in
(select? min(c.recordid) as recordid from? tab_record? c group by (c.dev_Id+c.StartTime+c.EndTime+c.CardNum));

?報錯如下：You can't specify target table '表名' for update in FROM clause

找到替代方案，改用下面的，OK:

delete from tab_record where recordid not in
(select min(c.recordid) as recordid from (select * from tab_record ) c group by (c.dev_Id+c.StartTime+c.EndTime+c.CardNum));

或者下面的也OK：

delete from tab_record where recordid not in
(select * from (
? select min(recordid) as recordid from tab_record group by (dev_Id+StartTime+EndTime+CardNum)) v);

轉載于:https://www.cnblogs.com/qima/p/3146051.html

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