如何在SQL Server上不使用“ WITH”或子查询的情况下简化此查询？

Question

我有一个查询，用于过滤我的表中仓库和商店中的正库存。

我只需要取正值，如果其中一个值为正，我就只取这个值。

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

我的查询结果是好的，我需要知道如何在没有“ WITH”或“子查询”的情况下简化此查询？

编辑**

为什么我不需要WITH或SubQuery是因为在这种情况下我认为是矫kill过正，并且我认为可以在没有WITH或Subquery的情况下进行此查询。

Answer 1

CTE或子选择有什么问题？

以下是一些方法，应该等效：

-使用CROSS APPLY逐行计算

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;

-如果我做对了，那么检查WHERE StockStores > 0 OR StockDepots > 0应该足够了

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，你可以这样做：

 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

请注意，原始case语句中的“ else”将永远不会执行，因为您只使用其中一个值大于0的行。我删除了它，因为这可能会引起混淆。

Answer 3

您可以在以下条件下直接使用：

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

您可以将数据推送到Temp Table ，然后以一种简单的方式使用该表。

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

尝试这个：

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