sql-server – 必须声明标量变量“@PreviousAmount”

2019年7月3日 220次阅读

这就是我所做的

Declare @PreviousAmount money   
set @PreviousAmount = 0

select @PreviousAmount  = @PreviousAmount  + Inp.AmountPaid
    From Invoice as Inv , InvoicePayment as Inp
    where Inv.InvoiceId = Inp.InvoiceId

我说错了
 “必须声明标量变量”@PreviousAmount“.”

更新 – 这是给出错误的实际代码

CREATE PROCEDURE [dbo].[spInvoiceTsk]
        @AmountPaid money 
AS
BEGIN
    SET NOCOUNT ON;
    Declare @PreviousAmount money 
    set @PreviousAmount = 0

select case 
        when (@AmountPaid = Inv.InvoiceAmount )
         Then @AmountPaid 

        else (
        select @PreviousAmount  = @PreviousAmount  + Inp.AmountPaid
        From dbo.Invoice as Inv , dbo.InvoicePayment as Inp
        where Inv.InvoiceId = Inp.InvoiceId
        )
        from dbo.Invoice as Inv

        --select *
        --from Invoice as a
        --Inner Join InvoicePayment as IP ON a.InvoiceId = IP.InvoiceId

    update I
    set I.AmountPaid = @PreviousAmount
    from Invoice as I , InvoicePayment as IP
    where I.AmountPaid = IP.AmountPaid

END
GO

最佳答案 您的查询中没有任何问题,我的猜测是您在执行查询时要离开声明部分,所以请尝试一次运行所有.请以下面的格式更改JOIN：

DECLARE @PreviousAmount MONEY   
SET @PreviousAmount = 0

SELECT @PreviousAmount  = @PreviousAmount  + Inp.AmountPaid
FROM Invoice AS Inv
INNER JOIN InvoicePayment AS Inp ON Inv.InvoiceId = Inp.InvoiceId
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