1:刪除重復數據

--第一步:先找到重復數據 select ProcInstID from record_errorlog group by ProcInstID having count(ProcInstID) > 1 --查看一下 select * from record_errorlog where ProcInstID in (select ProcInstID from record_errorlog group by ProcInstID having count(ProcInstID) > 1); --第二部 保留ErrorLogID最大的(也就是最新的數據) delete from record_errorlog where ProcInstID in (select ProcInstID from record_errorlog group by ProcInstID having count(ProcInstID) > 1) and ErrorLogID not in (select max(ErrorLogID) from record_errorlog group by ProcInstID having count(ProcInstID )>1); View Code

?

轉載于:https://www.cnblogs.com/YK2012/p/7525416.html

總結

以上是生活随笔為你收集整理的步步为营-89-SQL语句(删除重复数据)的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。