Question

我正在执行一个返回错误的程序：

子查询返回的值超过1。这是不允许的子查询跟随=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或当子查询用作表达。

我知道因为某些字段预计会返回超过1个值，但我需要处理它，我正在处理Debit，将减法结果归功于CR-DR等

(
   Conductor_ID
)
    Set @AccID= (Select Account_ID FROM Transport.Conductors WHERE ConductorID in (@ConductorID))
            Set @AccCredit= (Select CR from [dbo].[Transactions] where Account_ID in (@AccID))
            Set @AccDebit= (Select DR from [dbo].[Transactions] where Account_ID in (@AccID))
            Set @Total= @AccCredit-@AccDebit

Answer 1

试使用max（）：它将选择最大值，因此不会有任何多行选择冲突。

Set @AccID= (Select MAX(Account_ID) FROM Transport.Conductors WHERE         ConductorID in (@ConductorID))
        Set @AccCredit= (Select MAX(CR) from [dbo].[Transactions] where Account_ID in (@AccID))
        Set @AccDebit= (Select MAX(DR) from [dbo].[Transactions] where Account_ID in (@AccID))
        Set @Total= @AccCredit-@AccDebit

Answer 2

如果没有错，这就是你需要的

SELECT Account_ID,
       CR,
       DR,
       Total = CR - DR
FROM   [dbo].[Transactions] T
       JOIN Transport.Conductors C
         ON T.Account_ID = C.Account_ID
WHERE  C.ConductorID IN ( @ConductorID )

为什么sp返回错误：子查询返回超过1？

2 个答案: