按問題分組排序MSSQL

Question

我今年夏天一直在爲一家公司開發一個項目，即使在即將畢業的學校，我仍然非常喜歡noob，但我一直遇到與分組相關的問題和按子句排序的問題。

沒有我嘗試似乎工作，繼承人是我迄今爲止

SELECT DISTINCT ACT.ROW_ID , ACT.CREATED , MEM.FIRST_NAME , MEM.LAST_NAME , LOC.NAME , COUNT(*) as "number" , CAT.NAME , SER.NAME , EMP.FIRST_NAME , EMP.LAST_NAME , SER.DURATION , ACT.CASH , COS.NAME , ACT.COMMENTS , ACT.TIP FROM 
S_ACTIVITY ACT, S_LOCATION LOC, S_CATEGORY CAT, S_EMPLOYEE EMP, S_SERVICE SER, S_COST_CODE COS, S_MEMBER MEM 
WHERE ACT.EMPLOYEE_ID = EMP.ROW_ID AND ACT.SERVICE_ID = SER.ROW_ID AND ACT.CATEGORY_ID = CAT.ROW_ID AND ACT.COST_CODE_ID = COS.ROW_ID AND 
ACT.LOCATION_ID = LOC.ROW_ID AND ACT.MEMBER_ID = MEM.ROW_ID 
GROUP BY LOC.NAME 
ORDER BY number 

那與統計網上其他導遊在說我（的語法suuuuper由/訂單一塌糊塗組）需要一些排序或計數的訂單...繼承人原來...

SELECT DISTINCT ACT.ROW_ID , ACT.CREATED , MEM.FIRST_NAME , MEM.LAST_NAME , LOC.NAME , CAT.NAME , SER.NAME , EMP.FIRST_NAME , EMP.LAST_NAME , SER.DURATION , ACT.CASH , COS.NAME , ACT.COMMENTS , ACT.TIP FROM 
S_ACTIVITY ACT, S_LOCATION LOC, S_CATEGORY CAT, S_EMPLOYEE EMP, S_SERVICE SER, S_COST_CODE COS, S_MEMBER MEM 
WHERE ACT.EMPLOYEE_ID = EMP.ROW_ID AND ACT.SERVICE_ID = SER.ROW_ID AND ACT.CATEGORY_ID = CAT.ROW_ID AND ACT.COST_CODE_ID = COS.ROW_ID AND 
ACT.LOCATION_ID = LOC.ROW_ID AND ACT.MEMBER_ID = MEM.ROW_ID 
GROUP BY LOC.NAME 
ORDER BY LOC.NAME 

感謝您的幫助，非常感謝！ :)

Answer 1

明確連接 - 使用它們，他們都是偉大的。下面是一個例子：

SELECT DISTINCT ACT.ROW_ID , ACT.CREATED , MEM.FIRST_NAME , MEM.LAST_NAME , LOC.NAME , CAT.NAME , SER.NAME , EMP.FIRST_NAME , EMP.LAST_NAME , SER.DURATION , ACT.CASH , COS.NAME , ACT.COMMENTS , ACT.TIP FROM 
S_ACTIVITY ACT, S_LOCATION LOC, S_CATEGORY CAT, S_EMPLOYEE EMP, S_SERVICE SER, S_COST_CODE COS, S_MEMBER MEM 
WHERE ACT.EMPLOYEE_ID = EMP.ROW_ID AND ACT.SERVICE_ID = SER.ROW_ID AND ACT.CATEGORY_ID = CAT.ROW_ID AND ACT.COST_CODE_ID = COS.ROW_ID AND 
ACT.LOCATION_ID = LOC.ROW_ID AND ACT.MEMBER_ID = MEM.ROW_ID 

變爲

SELECT DISTINCT ACT.ROW_ID, ACT.CREATED, MEM.FIRST_NAME, MEM.LAST_NAME, LOC.NAME, 
       CAT.NAME, SER.NAME, EMP.FIRST_NAME, EMP.LAST_NAME, SER.DURATION, 
       ACT.CASH, COS.NAME, ACT.COMMENTS, ACT.TIP 
FROM  S_ACTIVITY ACT 
INNER JOIN S_LOCATION LOC ON ACT.LOCATION_ID = LOC.ROW_ID 
INNER JOIN S_CATEGORY CAT ON ACT.CATEGORY_ID = CAT.ROW_ID 
INNER JOIN S_EMPLOYEE EMP ON ACT.EMPLOYEE_ID = EMP.ROW_ID 
INNER JOIN S_SERVICE SER ON ACT.SERVICE_ID = SER.ROW_ID 
INNER JOIN S_COST_CODE COS ON ACT.COST_CODE_ID = COS.ROW_ID 
INNER JOIN S_MEMBER MEM ON ACT.MEMBER_ID = MEM.ROW_ID 

鮮明 - 鮮明是SELECT改性劑。它將結果限制爲不同的行，並且與使用GROUP BY all_columns_here相同。如果這是你的目標，那麼完全刪除你的GROUP BY，你很好去（見上面的查詢）。您可以使用一個GROUP BY或ORDER BY，或兩者 - 這導致了最後一點...

集團通過/順序按。這些不需要對方。另外，如果您有一個聚合，則只有SQL需要GROUP BY，並且只有特定功能需要ORDER BY。否則，您可以隨意使用它們來滿足您的項目需求。

Answer 2

這是讓你開始，因爲你是新來的SO。歡迎，BTW。

我真的會讀Gordon和Maciej的評論，以及關於JOINS的文章。祝你學習好。

這只是在語法上對於MSSQL的正確性，在JOIN上有一些假設。這不一定是你正在尋找的結果。

SELECT DISTINCT 
    ACT.ROW_ID, 
    ACT.CREATED, 
    MEM.FIRST_NAME, 
    MEM.LAST_NAME, 
    LOC.NAME, 
    COUNT(*) as "number", 
    CAT.NAME, 
    SER.NAME, 
    EMP.FIRST_NAME, 
    EMP.LAST_NAME, 
    SER.DURATION, 
    ACT.CASH, 
    COS.NAME, 
    ACT.COMMENTS, 
    ACT.TIP 
FROM 
    S_ACTIVITY ACT 
    INNER JOIN S_LOCATION LOC on ACT.LOCATION_ID = LOC.ROW_ID 
    INNER JOIN LOC. S_CATEGORY CAT ON ACT.CATEGORY_ID = CAT.ROW_ID 
    INNER JOIN S_EMPLOYEE EMP ON ACT.EMPLOYEE_ID = EMP.ROW_ID 
    INNER JOIN S_SERVICE SER ON ACT.SERVICE_ID = SER.ROW_ID 
    INNER JOIN S_COST_CODE COS ON ACT.COST_CODE_ID = COS.ROW_ID 
    INNER JOIN S_MEMBER MEM ON ACT.MEMBER_ID = MEM.ROW_ID 
GROUP BY 
    --every column that isn't an aggreggate... i.e. everything except COUNT(*). 
    ACT.ROW_ID, 
    ACT.CREATED, 
    MEM.FIRST_NAME, 
    MEM.LAST_NAME, 
    LOC.NAME, 
    CAT.NAME, 
    SER.NAME, 
    EMP.FIRST_NAME, 
    EMP.LAST_NAME, 
    SER.DURATION, 
    ACT.CASH, 
    COS.NAME, 
    ACT.COMMENTS, 
    ACT.TIP 
ORDER BY 
    --You can't use alias names in GROUP BY or ORDER BY clauses. 
    COUNT(*)