我如何使用情況，即隨着集團By語句

Question

我已經做了查詢，但它不給我我想要的東西：

SELECT  Designation_projet, COUNT(*) AS [Nb Demande], CASE WHEN Validation = 0 THEN COUNT(*) END AS Validée, CASE WHEN Validation = 1 THEN COUNT(*) 
     END AS NonValidée, CASE WHEN Commandé = 0 THEN COUNT(*) END AS NonCommandé, 
     CASE WHEN Commandé <> 0 THEN COUNT(*) END AS Commandé, SUM(TotalHT) AS TotalHT 
FROM   V_DemandeAchat 
GROUP BY Designation_projet,Commandé,Validation 

請幫我實現我的GOOL。

在此先感謝

Answer 1

你可以做到這一點使用情況彙總。這意味着CASE表達是參數SUM() - 它去「裏面」不是「外」：

SELECT Designation_projet, COUNT(*) AS [Nb Demande], 
     SUM(CASE WHEN Validation = 0 THEN 1 ELSE 0 END) as Validée, 
     SUM(CASE WHEN Validation = 1 THEN 1 ELSE 0 END) as NonValidée, 
     SUM(CASE WHEN Commandé = 0 THEN 1 ELSE 0 END) AS NonCommandé, 
     SUM(CASE WHEN Commandé <> 0 THEN 1 ELSE 0 END) END AS Commandé, 
     SUM(TotalHT) AS TotalHT 
FROM V_DemandeAchat 
GROUP BY Designation_projet; 

如果你想每Designation_projet一行，那麼應該在GROUP BY唯一的關鍵。

假設Validation發生在只有兩個值，可以簡化前兩個聚集表達式：

SELECT Designation_projet, COUNT(*) AS [Nb Demande], 
     SUM(1 - Validation) as Validée, 
     SUM(Validation = 1) as NonValidée, 
     SUM(CASE WHEN Commandé = 0 THEN 1 ELSE 0 END) AS NonCommandé, 
     SUM(CASE WHEN Commandé <> 0 THEN 1 ELSE 0 END) END AS Commandé, 
     SUM(TotalHT) AS TotalHT 
FROM V_DemandeAchat 
GROUP BY Designation_projet; 

您可以簡化Commandé表達式爲好。

Answer 2

試試這個

SELECT  Designation_projet, COUNT(*) AS [Nb Demande],sum(CASE WHEN Validation = 1 THEN 1 else 0 END AS Validée,sum(CASE WHEN Validation = 1 THEN 1 else 0 
     END AS NonValidée, sum(CASE WHEN NonCommandé <> 1 THEN 1 else 0 END AS NonCommandé, 
     sum(CASE WHEN Commandé <> 1 THEN 1 else 0 END AS Commandé, SUM(TotalHT) AS TotalHT 
FROM   V_DemandeAchat 
GROUP BY Designation_projet