用于处理多个更新行的SQL Server触发器。子查询返回多个值

Question

我得到这个触发器工作单行插入或更新，但是当我尝试一次更新多行时，它会给出错误的是，子查询返回多个值。

例如

update paymentdata 
set stat=1 

触发代码是在这里

USE [AGP] 
GO 

SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
ALTER TRIGGER [dbo].[OnpaymentUpdate] 
    ON [dbo].[paymentData] 
AFTER UPDATE --operations you want trigger to fire on 
AS 

BEGIN 


    SET NOCOUNT ON; 

    DECLARE @customerID NCHAR(50), @lastpaymentDate DATETIME, @stat nchar(50), @month int; 

    SET @customerID= (SELECT customerID FROM inserted) --table inserted contains inserted rows (or new updated rows) 

    SET @stat= (SELECT stat FROM inserted) --table inserted contains inserted rows (or new updated rows) 

    set @lastpaymentDate = (SELECT MAX(paymentDate) FROM paymentReceipt where customerID=@customerID) 


SET @month= (SELECT DATEDIFF(MONTH, @lastpaymentDate,GETDATE())) 
DECLARE @balance BIGINT 

    SET @balance = 
      (
       SELECT (totalprice-(paidAmount+concession)) 
       FROM paymentData 
       WHERE customerID = @customerID 
      ) 

    UPDATE PaymentData 
     SET balanceAmount = @balance , 
      lastpaymentDate=@lastpaymentDate 
    WHERE customerID = @customerID 


if (@month >=2 and @stat!='Cancel' and @stat!='Refund' And @stat!='Refunded' and @stat!='Transfered' and @stat!='Transfer') 
Begin 

IF (@month <2 and @stat='Defaulter') 
SET @stat='Regular' 
IF (@balance<=0) 
SET @stat='Payment Completed' 
else 
SET @stat='Defaulter' 
End 
else 
Begin 

if @stat='Refund' 
Set @stat='Refunded' 
if @stat='Cancled' 
Set @stat='Cancel' 
if @stat='Transfer' 
Set @stat='Transfered' 
End 

UPDATE PaymentData 
     SET stat =@stat 



    WHERE customerID = @customerID 

END 

Answer 1

如果我理解正确的这个，然后下面应该工作...试试看吧和纠正语法错误，你发现：
注意：我个人不会为此使用触发器。我会将此代码放入应用付款的商店过程中。

ALTER TRIGGER [dbo].[OnpaymentUpdate] 
    ON [dbo].[paymentData] 
AFTER UPDATE --operations you want trigger to fire on 
As 

BEGIN 
    Declare @today datetime = dateAdd(dd, datediff(dd, 0, getDate()), 0) 
    Declare @custInfo table 
     (custId integer Primary Key not null, 
     stat varChar(30) not null, 
     balance bigint not null, 
     lastPymnt datetime not null, 
     lastGap smallint not null) 

    Insert @custInfo(custId, stat, balance, lastPymnt, lastGap) 
    Select i.customerId, i.stat, 
     totalprice-(paidAmount+concession), 
     MAX(paymentDate), 
     Min(datediff(month, paymentDate, @today)) 
    From inserted i 
     join paymentReceipt r On r.customerId = i.customerId 
     join PaymentData d On d.CustomerId = i.customerId 
    Group By i.customerId, i.stat, 
     d.totalprice-(d.paidAmount + d.concession) 


    Update pd Set 
     balanceAmount = i.balance, 
     lastpaymentDate = i.lastPymnt, 
     stat = case When lastGap >=2 and i.stat!='Cancel' 
       and i.stat!='Refund' And i.stat!='Refunded' 
       and i.stat!='Transfered' and i.stat!='Transfer') Then Case 
        When @month >= 2 And i.stat='Defaulter' Then 'Regular' 
        When @balance<=0 Then 'Payment Completed' 
        Else 'Defaulter' End 
       Else Case @stat 
        When 'Refund' Then 'Refunded' 
        When 'Cancled' Then 'Cancel' 
        When 'Transfer' Then 'Transfered' End 
       End 
    From PaymentData pd Join @custInfo i 
     On i.custId = pd.customerID 
END