如何在SQL Server上不使用“ WITH”或子查詢的情況下簡化此查詢？

Question

我有一個查詢，用於過濾我的表中倉庫和商店中的正庫存。

我只需要取正值，如果其中一個值為正，我就只取這個值。

WITH Resultat AS
(
    SELECT AR_Ref,StockDepots,StockStores,
        CASE 
         WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
         WHEN StockDepots > 0 THEN StockDepots
         WHEN StockStores > 0 THEN StockStores
         ELSE StockDepots + StockStores
        END AS StockMulti
    FROM ArticleStock 
)    
SELECT * FROM Resultat
WHERE StockMulti > 0
ORDER BY AR_Ref

小提琴： http : //rextester.com/RMSU6120

我的查詢結果是好的，我需要知道如何在沒有“ WITH”或“子查詢”的情況下簡化此查詢？

編輯**

為什么我不需要WITH或SubQuery是因為在這種情況下我認為是矯kill過正，並且我認為可以在沒有WITH或Subquery的情況下進行此查詢。

Answer 1

CTE或子選擇有什么問題？

以下是一些方法，應該等效：

-使用CROSS APPLY逐行計算

SELECT AR_Ref,StockDepots,StockStores
      ,ca.StockMulti
FROM ArticleStock 
CROSS APPLY(SELECT CASE 
                    WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
                    WHEN StockDepots > 0 THEN StockDepots
                    WHEN StockStores > 0 THEN StockStores
                    ELSE StockDepots + StockStores END) AS ca(StockMulti)
WHERE StockMulti > 0
ORDER BY AR_Ref;

--Doubles的CASE

SELECT AR_Ref,StockDepots,StockStores
      ,CASE 
        WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
        WHEN StockDepots > 0 THEN StockDepots
        WHEN StockStores > 0 THEN StockStores
        ELSE StockDepots + StockStores END AS StockMulti
FROM ArticleStock 
WHERE CASE 
        WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
        WHEN StockDepots > 0 THEN StockDepots
        WHEN StockStores > 0 THEN StockStores
        ELSE StockDepots + StockStores END > 0
ORDER BY AR_Ref;

-如果我做對了，那么檢查WHERE StockStores > 0 OR StockDepots > 0應該足夠了

SELECT AR_Ref,StockDepots,StockStores
      ,CASE 
        WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
        WHEN StockDepots > 0 THEN StockDepots
        WHEN StockStores > 0 THEN StockStores
        ELSE StockDepots + StockStores END AS StockMulti
FROM ArticleStock 
WHERE StockStores > 0 OR StockDepots > 0
ORDER BY AR_Ref;

Answer 2

好吧，你可以這樣做：

 SELECT AR_Ref,StockDepots,StockStores,
    CASE 
     WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
     WHEN StockDepots > 0 THEN StockDepots
     WHEN StockStores > 0 THEN StockStores
    END AS StockMulti
FROM ArticleStock 
WHERE StockDepots > 0 or StockStores > 0
ORDER BY AR_Ref

請注意，原始case語句中的“ else”將永遠不會執行，因為您只使用其中一個值大於0的行。我刪除了它，因為這可能會引起混淆。

Answer 3

您可以在以下條件下直接使用：

SELECT AR_Ref,StockDepots,StockStores,
    CASE 
     WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
     WHEN StockDepots > 0 THEN StockDepots
     WHEN StockStores > 0 THEN StockStores
     ELSE StockDepots + StockStores
    END AS StockMulti
FROM ArticleStock 
where       (CASE 
     WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
     WHEN StockDepots > 0 THEN StockDepots
     WHEN StockStores > 0 THEN StockStores
     ELSE StockDepots + StockStores
    END) > 0
order by AR_Ref

Answer 4

您可以將數據推送到Temp Table ，然后以一種簡單的方式使用該表。

SELECT AR_Ref,StockDepots,StockStores,
    CASE 
     WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
     WHEN StockDepots > 0 THEN StockDepots
     WHEN StockStores > 0 THEN StockStores
     ELSE StockDepots + StockStores
    END AS StockMulti INTO #Test
FROM #ArticleStock 

SELECT * FROM #Test WHERE StockMulti > 0

Answer 5

嘗試這個：

SELECT * FROM
(
    SELECT AR_Ref,StockDepots,StockStores,
        CASE 
         WHEN StockDepots > 0 AND StockStores > 0  THEN StockDepots + StockStores
         WHEN StockDepots > 0 THEN StockDepots
         WHEN StockStores > 0 THEN StockStores
         ELSE StockDepots + StockStores
        END AS StockMulti
    FROM ArticleStock 
)    
Resultat
WHERE StockMulti > 0
ORDER BY AR_Ref