需要有关对此SQL表进行分组的帮助

Question

我有这张桌子

我想将它分组为

ProductID       Purchased      Sold
------------------------------------
1               235            0.00
2               125            0.00
3               55             24.00

此处已购买=（IsCreditor＆lt;＆gt; 0）

我试过这个

SELECT
    ProductID, 
    Max (TotalQty) As Purchased,
    Min(TotalQty) As Sold
FROM
    TestTable
GROUP BY
    ProductID

仅当产品同时具有IsCreditor = 0和IsCreditor = 1

时，它才有效

该表是存储过程的一小部分

在此表中，对于productid = 1，如果没有购买或出售，它将不会出现，如果它被购买，它会显示一个数量和IsCreditor = 1，如果它被出售，它会显示数量为一行IsCreditor = 0，另一行isCreditor = 1

Answer 1

添加CASE语句以分隔购买和出售的商品

    SELECT
        ProductID, 
        SUM(Case When IsCreditor = 1 then TotalQty else 0 end) AS [TotalPurchase],
        SUM(Case When IsCreditor = 0 then TotalQty else 0 end) AS [TotalSale]
    FROM
        TestTable
    GROUP BY
        ProductID