SQL和列依賴於其他列的值

-3

Doc_No , Doc_Type , Item_No , Added_Qty ,Deducted_Qty

我需要一個查詢返回結果集基於

if Doc_Type= "2" then select sum(Added_Qty) AS SUM_Added_Qty
if Doc_Type= "7" then select sum(Deducted_Qty) AS SUM_Deducted_Qty

and show SUM_Added_Qty - SUM_Deducted_Qty AS Stock

的成績必須在同一行

-------------------------------------------------------- 
| Item_No | SUM_Added_Qty | SUM_Deducted_Qty | Stock| 
--------------------------------------------------------

感謝您的幫助！

（系統是SQL Server）的

來源

2014-11-02 Salem Ahmed

你是什麼意思「系統是SQL」？是MySQL，Oracle，SQL-Server等嗎？ – Barmar 2014-11-02 06:50:13

SELECT Item_No, 
     SUM(CASE WHEN Doc_Type = '2' THEN Added_Qty ELSE 0 END) SUM_Added_Qty, 
     SUM(CASE WHEN Doc_Type = '7' THEN Deducted_Qty ELSE 0 END) SUM_Deducted_Qty, 
     SUM(CASE WHEN Doc_Type = '2' THEN Added_Qty 
       WHEN Doc_Type = '7' THEN -Deducted_Qty 
       ELSE 0 END) Stock 
FROM YourTable 
GROUP BY Item_No

來源

2014-11-02 06:54:57 Barmar

非常感謝:) 我想添加更多字段 SUM（CASE WHEN DOC_TYPE = '2' THEN Added_Qty WHEN DOC_TYPE = '7' THEN -Deducted_Qty - Requested_Qty ELSE 0 END）股票但它導致0 – 2014-11-02 07:50:11

SQL和列依賴於其他列的值

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