T-SQL在SQL Server 2012的JOIN中丟失記錄

Question

我有兩個表我試圖從SQL Server 2012中抽取數據。我將BO表中的記錄從JOIN丟棄到ItemNumber上的PO表中。我該如何解決這個問題？ BO表查詢最初抽取309行，完整查詢抽取280行。我知道PO表中存在的項目不存在於BO表格中，但我仍然需要在最終結果中看到這些項目，因此我可以說它們未被記錄下來。

SELECT 
    a.ItemNumber, 
    a.BOQty, 
    a.TtlBO$, 
    MIN(po.PBDUE) AS PODueDate 
FROM 
    dbo.PO po 
    RIGHT JOIN 
(SELECT 
    bo.ItemNumber, 
    SUM(bo.BOQty) AS BOQty, 
    SUM(bo.ExtPrice) AS TtlBO$ 
FROM 
    dbo.BO bo 
GROUP BY 
    bo.ItemNumber 
)a 
ON a.ItemNumber = po.PBITEM 
WHERE po.PBTYPE <> 'R' 
    AND po.PASTAT <> 'X' 
GROUP BY 
    a.ItemNumber, 
    a.BOQty, 
    a.TtlBO$ 
ORDER BY 
    ItemNumber 

Answer 1

這裏是我能得到我需要的東西：

SELECT 
     a.ItemNumber, 
     a.BOQty, 
     a.TtlBO$, 
     MIN(po.PBDUE) AS PODueDate 
    FROM 
     dbo.PO po 
     RIGHT JOIN 
    (SELECT 
     bo.ItemNumber, 
     SUM(bo.BOQty) AS BOQty, 
     SUM(bo.ExtPrice) AS TtlBO$ 
    FROM 
     dbo.BO bo 
    GROUP BY 
     bo.ItemNumber 
    )a 
    ON a.ItemNumber = po.PBITEM AND po.PBTYPE <> 'R' AND po.PASTAT <> 'X' 
     OR po.PBITEM IS NULL 
    GROUP BY 
     a.ItemNumber, 
     a.BOQty, 
     a.TtlBO$ 
    ORDER BY 
     ItemNumber