MS SQL函數 - 查詢條件參數變化輸入

Question

我正在研究下面這個SQL函數，但不知道如何使代碼條件WHERE基於標誌（@PastDueFlag，0或1傳遞） 。

請假定該函數中的整個查詢工作正常。我喜歡改變的唯一線條正好在WHERE 1 = 1「AND DATEDIFF（」d「，InvoiceDueDate，GETDATE（））> 0」之下。

當參數@PastDueFlag = 1時，我喜歡在查詢中包含這個條件，否則不要在WHERE查詢中包含此行。

有沒有辦法做到這一點？

感謝，

ALTER FUNCTION [dbo].[TotalARDueByCompanyID] 
(
    -- Add the parameters for the function here 
    @CompanyID AS INTEGER, 
    @PastDueFlag AS INTEGER 
) 
RETURNS Float 
AS 
BEGIN 
    DECLARE @TotalARDue AS Float 

    SET @TotalARDue = (
     SELECT SUM(CAST(GrandTotal AS NUMERIC(9,2)) + CAST(ISNULL(LinkedTxnAmount, 0) AS NUMERIC(9,2))) AS TotalARDue 
     FROM (
      select i.OrderID, InvoiceID, cp.CustomerPO, o.CompanyID, i.CreditMemo 
      , CONVERT(VARCHAR(10),(InvoiceDate + (SELECT TermDays FROM dbo.ERP_CompanyTerms WHERE TermID = i.TermID)), 101) AS InvoiceDueDate 
      , (isnull(FreightCost,0) + isnull(TaxState,0) + isnull(TaxCounty, 0) + isnull(TaxCity, 0)) 
      + 
      (SELECT SUM(ExtQty * UnitSell) FROM ERP_InvoiceDetail WHERE invoiceID = i.InvoiceID) as GrandTotal 
       --, isnull(i.FreightCost, 0) as FreightCost, i.ShipVia, i.WhoPays, i.Status 
      , CONVERT(VARCHAR(10), i.CreatedDate, 101) AS CreatedDate 
      , CONVERT(VARCHAR(10), i.InvoiceDate, 101) AS InvoiceDate 
      , (select Name from ERP_Company c where c.CompanyID = o.CompanyID) as CompanyName 
      , (select first_name + ' ' + last_name from employee where tech_id = i.createdBy) as CreatedBy 
      , (SELECT em2.first_name + ' ' + em2.last_name) AS SalesRep 
      , (SELECT em2.tech_id) AS SalesRepID 
      , o.SOTypeInt AS SOType, em2.WH_RegionID AS Region, i.Status, qv.SFOppt 
      , (
       SELECT 
        (SELECT CASE 
         WHEN CreditMemo = 1 THEN 
          SUM(qi.LinkedTxnAmount) * -1 
         ELSE 
          SUM(qi.LinkedTxnAmount) 
         END 
       ) 
       FROM dbo.ERP_Invoice i2 
       LEFT JOIN dbo.QuickBooks_InvoiceLinked qi ON RefNumber = CAST(i2.InvoiceID AS VARCHAR(8)) 
       WHERE 1 = 1 
       AND InvoiceID = i.invoiceID -- 305763, 304990 
       AND LinkedTxnTxnType <> 
        CASE 
         WHEN i2.CreditMemo = 1 THEN 
          'CreditMemo' 
         ELSE 
          '' 
        END 
       GROUP BY CreditMemo 
      ) AS LinkedTxnAmount 
      from ERP_Invoice i 
      LEFT JOIN ERP_Order o on o.OrderID = i.OrderID 
      INNER JOIN ERP_Company c on o.CompanyID = c.CompanyID 
      LEFT JOIN Employee em on em.Tech_ID = i.CreatedBy 
      LEFT JOIN Employee em2 ON em2.Tech_ID = o.SalesPersonID 
      LEFT JOIN ERP_QuoteVer qv ON qv.QuoteVerID = o.QuoteVerID 
      LEFT JOIN dbo.ERP_CustomerPO cp ON cp.CustomerPOID = i.CustomerPOID 
      where 1 = 1 
     ) a 
     WHERE 
     1 = 1 
     AND DATEDIFF("d", InvoiceDueDate, GETDATE()) > 0 
     AND CAST(GrandTotal AS NUMERIC(9,2)) + CAST(ISNULL(LinkedTxnAmount, 0) AS numeric(9,2)) > 0 
     AND CompanyID = @CompanyID 
     AND Status in ('New', 'Completed') 
     AND SOType = 'Production' 
    ) 

    -- Return the result of the function 
    RETURN @TotalARDue 

END 

Answer 1

我認爲你需要做的就是你的參數值集成到您的where條款：

WHERE ((@PastDueFlag =1 and DATEDIFF("d", InvoiceDueDate, GETDATE()) > 0) or 
     (@PastDueFlag = 0)) and ... 

也，你不應該需要在1 = 1倍的標準你的WHERE子句