在SQL Server中創建派生表

Question

我需要一些幫助來總結兩個（或更多）別名列。 我知道我需要一個派生表來完成它，但到目前爲止，我迷失在線教程和文檔，因爲它們的示例太簡單了。他們只有一個表，兩列等

什麼能在這裏我最好的選擇： 我需要計算兩個別名列的總和：「InFxO」和「OnTxO」和我的代碼如下：

ALTER PROC [dbo].[DIFOTIS] 
@Mode as Varchar (5) 
AS 
Begin 
Declare 

@StartDate date, 
@EndDate date 

SET @StartDate= 
CASE @Mode 
WHEN 'MTD' THEN DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0) 
WHEN 'YTD' THEN DATEADD(yy,DATEDIFF(yy,0,GETDATE()),0) 
WHEN 'QTD' THEN DATEADD(qq,DATEDIFF(qq,0,GETDATE()),0) 
WHEN 'WTD' THEN DATEADD(wk,DATEDIFF(wk,0,GETDATE()),0) 
END 
Set @EndDate= 
CASE @Mode 
WHEN 'MTD' THEN DATEADD(mm,DATEDIFF(mm,0,GETDATE())+1,0) 
WHEN 'YTD' THEN DATEADD(yy,DATEDIFF(yy,0,GETDATE())+1,0) 
WHEN 'QTD' THEN DATEADD(qq,DATEDIFF(qq,0,GETDATE())+1,0) 
WHEN 'WTD' THEN DATEADD(wk,DATEDIFF(wk,0,GETDATE())+1,0) 
END 


Select DATEPART(ISO_WEEK,d.DateOpn) AS 'Week#' 
,Clients.CustCateg, Clients.ClntGroup 
,d.DocumentCode as 'CORD_DocumentCode' 
,CDSPDocs.DocumentCode AS 'DESP_DocumentCode' 
,Count(CORDLines.Qnty) AS 'Cord_Lines' 
,SUM(CORDLines.Qnty) AS 'CORD_Qty' 
,Count(CDSPLines.Qnty) AS 'DESP_Lines' 
,Sum(CDSPLines.Qnty) AS 'DESP_Qty' 
,CDSPLines.Status, d.Status as d_status 
,d.OpenDate, d.DateDue 
,CDSPDocs.PostDate AS 'DESP_PostedDate' 
,d.DocType, DATEDIFF(day, d.OpenDate, d.DateDue) AS 'Lead times' 

    --in-full 

,CASE WHEN SUM(CORDLines.Qnty) = Sum(CDSPLines.Qnty) THEN '1' ELSE '0' END as InFxO 


    --On-Time by order according to Despatch SLAs 

,CASE WHEN (Clients.ClntGroup IN ('Local Market','Local Market - Pharm','Web Sales - Local','Web Sales - Export', 'Mail Order','Mail Order - Export')) AND (Datediff(day, d.OpenDate, CDSPDocs.PostDate) - (Datediff(Week, d.OpenDate, CDSPDocs.PostDate)*2) <= 2) then '1' 
     WHEN (Clients.ClntGroup = 'Export Market') AND (Datediff(day, d.OpenDate, CDSPDocs.PostDate) - (Datediff(Week, d.OpenDate, CDSPDocs.PostDate)*2) <= 14) then '1' 
     WHEN (Clients.ClntGroup = 'Export Market') or Clients.CustCateg = 'UK Transfer' AND (d.DateDue >= CDSPDocs.PostDate) then '1' 
     ELSE '0' 
     END as OnTxO 


From dbo.Documents AS d INNER JOIN 
    dbo.Clients ON d.ObjectID = dbo.Clients.ClntID AND Clients.ClientName <> 'Samples - Free/Give-aways' LEFT Outer JOIN 
    dbo.DocumentsLines AS CORDLines ON d.DocID = CORDLines.DocID AND CORDLines.TrnType = 'L' 
    LEFT OUTER JOIN 
    dbo.DocumentsLines AS CDSPLines ON CORDLines.TranID = CDSPLines.SourceID AND CDSPLines.TrnType = 'L' AND (CDSPLines.Status = 'Posted' OR CDSPLines.Status = 'Closed') LEFT OUTER JOIN 
    dbo.Documents AS CDSPDocs ON CDSPLines.DocID = CDSPDocs.DocID 

WHERE (d.DocType IN ('CASW', 'CORD','MORD')) 
AND (CORDLines.LneType NOT In ('Fght','MANF','Stor', 'PACK','EXPS')) 
AND d.DateOpn >= @StartDate AND d.DateOpn < @EndDate 
AND (CORDLines.LneType is not null) 
AND (d.DateDue <= Convert(Date, GetDate(), 101)) 

Group by d.DateOpn 
,d.DocumentCode 
,Clients.CustCateg 
,CDSPDocs.DocumentCode 
,d.[Status] 
,d.DocType 
,d.OpenDate 
,d.DateReq 
,CDSPDocs.PostDate 
,CDSPLines.[Status] 
,Clients.ClntGroup 
,d.DocumentName 
,d.DateDue 
,d.DateOpn 

ORDER BY d.DateOpn, 'Week#' 
    END 


GO 

所有幫助表示讚賞。 謝謝 H

Answer 1

下面是一個將原始查詢包裝在派生表中的示例，以便您不需要重複SUM的CASE表達式。您可以類似地將查詢包裝在公用表格表達式中以獲得相同的結果。

我建議您僅使用單引號將字符串文字括起來，並使用方括號或雙引號括起標識符（列名，別名和對象名稱），如SQL Server聯機叢書參考（http://msdn.microsoft.com/en-us/library/ms175874.aspx）中所述。標識符只有當它們不符合標識符命名規則或者是保留關鍵字時才需要被包含。

ALTER PROC dbo.DIFOTIS @Mode AS varchar(5) 
AS 
    BEGIN 
     DECLARE @StartDate date 
      , @EndDate date; 

     SET @StartDate = CASE @Mode 
          WHEN 'MTD' 
          THEN DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0) 
          WHEN 'YTD' 
          THEN DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0) 
          WHEN 'QTD' 
          THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0) 
          WHEN 'WTD' 
          THEN DATEADD(wk, DATEDIFF(wk, 0, GETDATE()), 0) 
         END; 
     SET @EndDate = CASE @Mode 
         WHEN 'MTD' 
         THEN DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 1, 0) 
         WHEN 'YTD' 
         THEN DATEADD(yy, DATEDIFF(yy, 0, GETDATE()) + 1, 0) 
         WHEN 'QTD' 
         THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) + 1, 0) 
         WHEN 'WTD' 
         THEN DATEADD(wk, DATEDIFF(wk, 0, GETDATE()) + 1, 0) 
         END; 

     SELECT Week# 
       , CustCateg 
       , ClntGroup 
       , CORD_DocumentCode 
       , DESP_DocumentCode 
       , Cord_Lines 
       , CORD_Qty 
       , DESP_Lines 
       , DESP_Qty 
       , Status 
       , d_status 
       , OpenDate 
       , DateDue 
       , DESP_PostedDate 
       , DocType 
       , [Lead times] 
       , InFxO 
       , OnTxO 
       , InFxO + OnTxO AS InFullAndOneTime 
     FROM (

      SELECT DATEPART(ISO_WEEK, d.DateOpn) AS Week# 
        , Clients.CustCateg 
        , Clients.ClntGroup 
        , d.DocumentCode AS CORD_DocumentCode 
        , CDSPDocs.DocumentCode AS DESP_DocumentCode 
        , COUNT(CORDLines.Qnty) AS Cord_Lines 
        , SUM(CORDLines.Qnty) AS CORD_Qty 
        , COUNT(CDSPLines.Qnty) AS DESP_Lines 
        , SUM(CDSPLines.Qnty) AS DESP_Qty 
        , CDSPLines.Status 
        , d.Status AS d_status 
        , d.OpenDate 
        , d.DateDue 
        , CDSPDocs.PostDate AS DESP_PostedDate 
        , d.DocType 
        , DATEDIFF(DAY, d.OpenDate, d.DateDue) AS [Lead times] 

     --in-full 
        , CASE WHEN SUM(CORDLines.Qnty) = SUM(CDSPLines.Qnty) THEN 1 
         ELSE 0 
        END AS InFxO 
     --On-Time by order according to Despatch SLAs 
        , CASE WHEN (Clients.ClntGroup IN ('Local Market', 
                 'Local Market - Pharm', 
                 'Web Sales - Local', 
                 'Web Sales - Export', 
                 'Mail Order', 
                 'Mail Order - Export')) 
           AND (DATEDIFF(DAY, d.OpenDate, CDSPDocs.PostDate) 
            - (DATEDIFF(WEEK, d.OpenDate, 
               CDSPDocs.PostDate) * 2) <= 2) 
         THEN 1 
         WHEN (Clients.ClntGroup = 'Export Market') 
           AND (DATEDIFF(DAY, d.OpenDate, CDSPDocs.PostDate) 
            - (DATEDIFF(WEEK, d.OpenDate, 
               CDSPDocs.PostDate) * 2) <= 14) 
         THEN 1 
         WHEN (Clients.ClntGroup = 'Export Market') 
           OR Clients.CustCateg = 'UK Transfer' 
           AND (d.DateDue >= CDSPDocs.PostDate) THEN '1' 
         ELSE 0 
        END AS OnTxO 
      FROM dbo.Documents AS d 
        INNER JOIN dbo.Clients ON d.ObjectID = dbo.Clients.ClntID 
               AND Clients.ClientName <> 'Samples - Free/Give-aways' 
        LEFT OUTER JOIN dbo.DocumentsLines AS CORDLines ON d.DocID = CORDLines.DocID 
                    AND CORDLines.TrnType = 'L' 
        LEFT OUTER JOIN dbo.DocumentsLines AS CDSPLines ON CORDLines.TranID = CDSPLines.SourceID 
                    AND CDSPLines.TrnType = 'L' 
                    AND (CDSPLines.Status = 'Posted' 
                    OR CDSPLines.Status = 'Closed' 
                   ) 
        LEFT OUTER JOIN dbo.Documents AS CDSPDocs ON CDSPLines.DocID = CDSPDocs.DocID 
      WHERE (d.DocType IN ('CASW', 'CORD', 'MORD')) 
        AND (CORDLines.LneType NOT IN ('Fght', 'MANF', 'Stor', 
                'PACK', 'EXPS')) 
        AND d.DateOpn >= @StartDate 
        AND d.DateOpn < @EndDate 
        AND (CORDLines.LneType IS NOT NULL) 
        AND (d.DateDue <= CONVERT(date, GETDATE(), 101)) 
      GROUP BY d.DateOpn 
        , d.DocumentCode 
        , Clients.CustCateg 
        , CDSPDocs.DocumentCode 
        , d.Status 
        , d.DocType 
        , d.OpenDate 
        , d.DateReq 
        , CDSPDocs.PostDate 
        , CDSPLines.Status 
        , Clients.ClntGroup 
        , d.DocumentName 
        , d.DateDue 
        , d.DateOpn 
     ) AS derived_table 
     ORDER BY d.DateOpn 
       , Week#; 
    END; 
GO