用SQL計算（）特定記錄在另一個* AND *表中

Question

這與我最近詢問的另一個問題類似，但會更進一步。

我上一個問題問我如何用tblCurrent構建視圖，同時從tblHistorical中檢索特定相關記錄的計數。

我現在想知道如何做同樣的，但補充說，指望基於來自同一tblCurrent表中的特定條件的記錄了另外兩列。

我有兩個表：

tblCurrent 
Ref | CustomerID | Category | Subcategory | Resolved | ... .. .. . . | 
X001 | 001  | Sales | Major  | TRUE 
X002 | 002  | Sales | Minor  | FALSE 
X003 | 001  | Marketing | Corp  | TRUE 


tblHistorical 
Ref | ... .. .. . . | Missing | Matched 
X001 | ... .. .. . . | TRUE | FALSE 
X001 | ... .. .. . . | FALSE | FALSE 
X002 | ... .. .. . . | TRUE | TRUE 
X002 | ... .. .. . . | TRUE | FALSE 
X003 | ... .. .. . . | FALSE | FALSE 
X003 | ... .. .. . . | TRUE | TRUE 

裁判在tblCurrent獨一無二的，但不是歷史。

，我被告知，併成功得到了工作了前面的問題如下：

SELECT a.ref, 
    SUM(CASE WHEN b.Missing = 'True' THEN 1 ELSE 0 END) missingTrue, 
    SUM(CASE WHEN b.Missing = 'False' THEN 1 ELSE 0 END) missingFalse, 
    SUM(CASE WHEN b.Matched = 'True' THEN 1 ELSE 0 END) matchTrue 
FROM tblCurrent a 
    LEFT JOIN tblHistorical b 
     on a.ref = b.ref 
GROUP BY a.ref 

問：我如何添加了另外兩列（上述解決方案），其數：

• tblCurrent中匹配相同的CustomerID + Category（但不是當前記錄）的記錄數AND AND Resolved = False。
• tblCurrent中匹配相同的記錄數CustomerID + Category + SubCategory（但不是當前記錄）AND Resolved = False。

Answer 1

試試這個：

SELECT a.ref， SUM（case when b.Missing ='True'THEN 1 ELSE 0 END）missingTrue， SUM（CASE when when b.Missing ='False'THEN 1 ELSE 0 END）missingFalse， SUM（CASE WHEN b.Matched ='真正的」 THEN ELSE 1 0 END）matchTrue， COUNT（DISTINCT a.CustomerID）作爲CustomerID_count - <添加此行 FROM tblCurrent一個 LEFT JOIN tblHistorical b 上a.ref = b.ref GROUP BY a.ref

編輯：

根據您的更新問題，如果我正確理解你的問題，

;WITH 
CATEGORY AS 
     (SELECT CustomerID ,Category,COUNT(*) AS CNT 
     FROM tblCurrent 
     GROUP BY CustomerID ,Category), 

SUBCATEGORY AS 
     (SELECT CustomerID ,Category,SubCategory,COUNT(*) AS CNT 
     FROM tblCurrent 
     GROUP BY CustomerID ,Category,SubCategory), 

MAIN  AS (
SELECT a.ref, 
     SUM(CASE WHEN b.Missing = 'True' THEN 1 ELSE 0 END) missingTrue, 
     SUM(CASE WHEN b.Missing = 'False' THEN 1 ELSE 0 END) missingFalse, 
     SUM(CASE WHEN b.Matched = 'True' THEN 1 ELSE 0 END) matchTrue 
     FROM tblCurrent a 
     LEFT JOIN tblHistorical b 
      on a.ref = b.ref 
     GROUP BY a.ref 
) 
SELECT M.* ,C.CNT AS CATEGORY_COUNT, 
     S.CNT AS SUBCATEGORY_COUNT 
FROM MAIN M 
JOIN tblCurrent T 
ON  M.ref=T.ref 
JOIN CATEGORY C 
ON  C.CustomerID=T.CustomerID 
AND  C.Category=T.Category 
JOIN SUBCATEGORY S 
ON  S.CustomerID=T.CustomerID 
AND  C.Category=T.Category 
AND  S.SubCategory=T.SubCategory 

Answer 2

添加COUNT(DISTINCT)到tblCurrent的唯一ID - 即：

SELECT a.ref, 
    COUNT(DISTINCT tblCurrent.Ref), 
    SUM(CASE WHEN b.Missing = 'True' THEN 1 ELSE 0 END) missingTrue, 
    SUM(CASE WHEN b.Missing = 'False' THEN 1 ELSE 0 END) missingFalse, 
    SUM(CASE WHEN b.Matched = 'True' THEN 1 ELSE 0 END) matchTrue 
FROM tblCurrent a 
    LEFT JOIN tblHistorical b 
     on a.ref = b.ref 
GROUP BY a.ref 

Answer 3

您可以通過CTE解決這個問題：

 
WITH tmp AS (
    SELECT CustomerId, COUNT(*) AS cnt 
    FROM tblCurrent) 
SELECT a.ref, tmp.cnt, ... 
FROM tblCurrent a 
LEFT JOIN tblHistorical b 
    ON a.ref = b.ref 
LEFT JOIN tmp 
    ON tmp.CustomerId = a.CustomerId 
... 

Answer 4

您可以在CASE語句中使用多個條件。所以你可以做「CASE WHEN a = b AND c = d THEN 1 ELSE 0 END」。這有幫助嗎？