SQL Server存儲過程中的SUM（）

Question

這裏我試圖獲取如下數據(EXPECTED)。

ID | Project | SC | PO | INV 
---+---------+------+------+----- 
1 | test1 | NULL | 1 | NULL 
2 | test2 | NULL | NULL | NULL 

但按我的存儲過程，我得到的輸出作爲

ID | Project | SC | PO | INV 
---+---------+------+----+----- 
1 | test1 | NULL | 1 | NULL 
2 | test2 | NULL | 1 | NULL 

也許結果從我的內心查詢顯示PO收到的Project test1爲PO test2了。哪些不應該發生。因爲項目'test1'出現在BudgetDetails和Details表中。

任何幫助球員糾正我寫的總和（）查詢？

SELECT 
    BD.ID, BD.Project, 
    (SELECT SUM(Amount) AS SC 
    FROM Details (NOLOCK) a 
    INNER JOIN BudgetDetails (NOLOCK) b ON a.Project = b.Project 
    WHERE ProcurementStatus = 'SC' AND a.Project = b.Project) AS SC, 
    (SELECT SUM(Amount) as PO 
    FROM Details (NOLOCK) a 
    INNER JOIN BudgetDetails(NOLOCK) b ON a.Project = b.Project 
    WHERE ProcurementStatus = 'PO' AND a.Project = b.Project) AS PO, 
    (SELECT SUM(Amount) as INV 
    FROM Details (NOLOCK) a 
    INNER JOIN BudgetDetails(NOLOCK) b ON a.Project = b.Project 
    WHERE ProcurementStatus = 'INV' AND a.Project = b.Project) AS INV 
FROM 
    BudgetDetails (NOLOCK) BD 
WHERE 
    BD.Quarter = @Quarter AND BD.Year = @Year 
GROUP BY 
    BD.ID, BD.Project 

Answer 1

解決您查詢，您將需要在你的子查詢AND a.Project = BD.Project

你最好使用CASE語句或PIVOT重新寫

SELECT 
    BD.ID, BD.Project, 
    SUM(CASE WHEN ProcurementStatus = 'SC' THEN Amount END) as SC, 
    SUM(CASE WHEN ProcurementStatus = 'PO' THEN Amount END) as PO, 
    SUM(CASE WHEN ProcurementStatus = 'INV' THEN Amount END) as INV, 

FROM 
     BudgetDetails (NOLOCK) BD 
LEFT JOIN 
     Details (NOLOCK) D ON BD.Project = D.Project 
WHERE 
     BD.Quarter = @Quarter 
AND BD.Year = @Year 
GROUP BY 
     BD.ID, 
     BD.Project 

編輯1：從變化INNER JOIN到LEFT JOIN反映@初學者的要求