sql-server - 计算每种产品(墨水代码)的库存

我有2个表Tblinkreceiving和Tblinkdelivery。我想显示每种墨水代码的库存余额。我尝试了以下sql join查询，但是当我在手动计算中进行交叉检查时，许多墨水代码的计算是错误的。

select r.inkcode, SUM(r.quantity) Stock-In, SUM(d.quantity) Stock-out, (SUM(r.quantity) - SUM(d.quantity)) Stock-Balance from Tblinkreceiving r,Tblinkdelivery d where r.inkcode=d.inkcode
group by r.inkcode;

最佳答案

WITH    i AS
        (
        SELECT  inkcode, SUM(quantity) AS qin
        FROM    tblInkReceiving
        GROUP BY
                inkcode
        ),
        o AS
        (
        SELECT  inkcode, SUM(quantity) AS qout
        FROM    tblInkDelivery
        GROUP BY
                inkcode
        )
SELECT  COALESCE(i.inkcode, o.inkcode) AS inkcode,
        COALESCE(qin, 0) AS stock_in,
        COALESCE(qout, 0) AS stock_out,
        COALESCE(qin, 0) - COALESCE(qout, 0) AS stock_balance
FROM    i
FULL JOIN
        o
ON      o.inkcode = i.inkcode

关于sql-server - 计算每种产品(墨水代码)的库存，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10294393/