Question

我有这个存储过程，我想用于我的SAP水晶报告。

SELECT
    t0.DocNum AS ReceiptNo, t2.DocEntry AS InvoiceNo, 
    t0.DocDate, t1.CheckAct,
    t1.CheckNum, t3.AcctName, 
    CASE 
        WHEN (t0.CardName IS NULL) THEN t0.Address
                                   ELSE t0.CardName
    END AS CustName,
    CASE 
        WHEN ((t1.CheckNum IS NULL OR t1.CheckNum = 0)
               AND t0.TrsfrRef IS NULL) THEN 'Cash'
        WHEN (t1.CheckNum > 0
               AND t0.TrsfrRef IS NULL) THEN 'Cheque'
        ELSE 'Transfer'
    END AS PayType, 
    CASE 
        WHEN (t1.CheckNum > 0 AND t0.TrsfrRef IS NULL) THEN t1.CheckSum
        ELSE t0.DocTotal
    END AS DocTotal
FROM
    ORCT t0
LEFT OUTER JOIN 
    RCT1 t1 ON t1.docnum = t0.docnum
LEFT OUTER JOIN 
    RCT2 t2 ON t0.DocEntry = t2.DocNum
LEFT OUTER JOIN 
    OACT t3 ON t1.CheckAct = t3.AcctCode
WHERE
    t0.DocDate BETWEEN @BeginDate AND @EndDate
    AND t0.Canceled = 'N'
    AND t3.AcctCode = @Account

在最后一行，我已声明一个变量@Account，可按帐号过滤结果。我希望我的报告能够工作，如果未选择帐户（null），则返回所有帐号的结果。

我如何实现这一目标？

任何帮助表示感谢。

Answer 1

如果@Account为空，听起来您希望有效地省略最后一个子句。如果是这样，那么试试这个：

... AND t0.Canceled = 'N' AND
(@Account IS NULL OR t3.AcctCode = @Account)

Answer 2

添加到最后

or t3.AcctCode is null

Answer 3

您可以使用IF ELSE例如

IF @Account IS NULL
    BEGIN
        --Your Query without "AND t3.AcctCode = @Account"
    END
ELSE
    BEGIN
        -- Your Query
    END

您还可以将最后一行更改为：

AND (t3.AcctCode = @Account OR @Account IS NULL)

如果变量为null，则不过滤的存储过程

3 个答案: