MySql select 语句有效但不能删除

Question

SET @UserID_In = 1;
Select * FROM EarnedTransaction AS ETMain WHERE ETMain.UserID = @UserID_In
  AND ETMain.ID = ( SELECT MAX(ID) FROM EarnedTransaction AS ETSub WHERE ETSub.UserID = 
    ETMain.UserID AND ETSub.TransactionType = 'Buying' AND ETSub.CompleteDate IS NULL )
  AND ETMain.ID = ( SELECT MAX(ID) FROM EarnedTransaction AS ETSub WHERE ETSub.UserID =             
    ETMain.UserID );

返回 34 ​​15 购买 1500 1428101231 1 2014-09-29 10:09:55

但是:

SET @UserID_In = 1;
Delete FROM EarnedTransaction AS ETMain WHERE ETMain.UserID = @UserID_In
   AND ETMain.ID = ( SELECT MAX(ID) FROM EarnedTransaction AS ETSub WHERE ETSub.UserID = 
       ETMain.UserID AND ETSub.TransactionType = 'Buying' AND ETSub.CompleteDate IS NULL )
   AND ETMain.ID = ( SELECT MAX(ID) FROM EarnedTransaction AS ETSub WHERE ETSub.UserID =                   
       ETMain.UserID );

返回: [Err] 1064 - 您的 SQL 语法有错误； 请查看与您的 MySQL 服务器版本相对应的手册，了解在 AS ETMain WHERE ETMain.UserID = @UserID_In 附近使用的正确语法 AND ETMain.ID = ( SELECT MAX(ID) 在第 1 行

Answer 1

试试这个删除查询(没有“删除表”的别名):

SET @UserID_In = 1;
DELETE FROM EarnedTransaction 
      WHERE UserID = @UserID_In
        AND ID = (SELECT MAX(ID) 
                    FROM EarnedTransaction AS ETSub 
                   WHERE ETSub.UserID = UserID 
                     AND ETSub.TransactionType = 'Buying' 
                     AND ETSub.CompleteDate IS NULL)
        AND ID = (SELECT MAX(ID) 
                    FROM EarnedTransaction AS ETSub 
                   WHERE ETSub.UserID = UserID );