MYSQL如何修改查詢出來的結果集

  update expresspackage  set IsUploadSto=-200  where BillCode in
   (
       SELECT BillCode from expresspackage where RealLatticeNo not in (224,448) and 
       `Status` = 0 and DownTime < '2022/1/26 15:29:03' and 
       createTime < '2022/1/26 15:29:03' and IsUploadSto > -20 and IsUploadSto < 1
   )

執行上訴語句出現You can't specify target table for update in FROM clause 不能在同一表中查詢的數據作為同一表的更新數據。

改成下述語句就行

  update expresspackage  set IsUploadSto=-200  where BillCode in
   (
   SELECT a.BillCode from 
   (
   SELECT BillCode from expresspackage where RealLatticeNo not in (224,448) and 
   `Status` = 0 and DownTime < '2022/1/26 15:29:03' and 
   createTime < '2022/1/26 15:29:03' and IsUploadSto > -20 and IsUploadSto < 1
   ) a
   )

也就是說將select出的結果再通過中間表select一遍，這樣就規避了錯誤。注意，這個問題只出現於mysql，mssql和Oracle不會出現此問題。