带求和函数的多表连接语句

Question

我是 SQL 的新手，我必须生成以下报告。

| Customer Name | Available Quantity | Received Quantity | Shipped Quantity
| ABC           | 100                | 0                 | 25              |
| XYZ           | 345                | 20                | 0               |

Stock
Customer
Available Quantity

Receipt
Customer
Received Quantity
Received Date

Dispatch
Customer
Shipped Quantity
Shipped Date

股票表将显示所有客户名称。 Receipt 和 Ship 表将具有按日期计算的数量，因此 SQL 查询将具有日期参数（两个表相同）。我设法加入了一张桌子，但第三张桌子对我和日期都不适用。

SELECT dbo.Stock.Customer, SUM(dbo.Stock.[Available Quantity]) AS AvailableQty, O.ShippedQty
FROM     (SELECT Customer, SUM([Shipped Quantity]) AS ShippedQty
                  FROM      dbo.Dispatch
                  GROUP BY Customer) AS O LEFT OUTER JOIN
                  dbo.Stock ON dbo.Stock.Customer= O.Customer
GROUP BY dbo.Stock.Customer, O.ShippedQty