Sql server 计算每个产品（Inkcode）的库存

我有两个表TBLINK接收和TBLINK发送。我想显示每个inkcode的库存余额。我尝试了下面的sql join查询，但在手动计算中交叉检查时，许多inkcode的计算都是错误的。哪里出错了

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;

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您已使用内部联接（隐式）来组合接收和传递。这意味着任何已接收但未交付的墨水代码都将从结果中排除

如果您可以假设，对于任何墨水交付，都必须有墨水收据（基于您无法交付尚未收到的内容的前提），那么您可以在tblInkReceiving上使用内部联接，如下所示：

SELECT r.inkcode, 
    SUM(r.quantity) AS Stock-In, 
    ISNULL(SUM(d.quantity), 0) AS Stock-out,
    SUM(r.quantity) - ISNULL(SUM(d.quantity), 0) AS Stock-Balance 
FROM Tblinkreceiving r LEFT JOIN Tblinkdelivery d ON r.inkcode = d.inkcode
GROUP BY r.inkcode

左连接将返回左侧（r）的所有记录，包括右侧（d）的匹配记录。如果d没有匹配的记录（即该墨水代码没有墨水交付），则这些行的值将为空

如果您不能假设墨水只有在收到后才能送达，那么您需要链接到墨水表（即inkcode为主键的表），或者合并接收表和送达表中的所有墨水代码，并链接到：

;WITH cte AS (SELECT inkcode FROM Tblinkreceiving 
    UNION 
    SELECT inkcode FROM Tblinkdelivery)
SELECT cte.inkcode, 
    SUM(r.quantity) AS Stock-In, 
    ISNULL(SUM(d.quantity), 0) AS Stock-out,
    SUM(r.quantity) - ISNULL(SUM(d.quantity), 0) AS Stock-Balance 
FROM cte LEFT JOIN Tblinkreceiving r ON cte.ink_code = r.ink_code
    LEFT JOIN Tblinkdelivery d ON cte.inkcode = d.inkcode
GROUP BY cte.inkcode

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请发布一些示例数据和所需输出。参考编号接收日期inkcode数量价格接收ID 1001 2012-03-17 HP[130]20 107 18 1002 2012-03-25 HP[121]10 57 19参考编号交付日期inkcode数量交付平均价格2001-03-03 HP[121]1 28 63 2002 2012-03-06 HP 78A 5 29 195我如何使用表格中的deliverdate和receiverdate获得datewise月报？我如何使用表格中的deliverdate和receiverdate获得datewise月报？

;WITH cte AS (SELECT inkcode FROM Tblinkreceiving 
    UNION 
    SELECT inkcode FROM Tblinkdelivery)
SELECT cte.inkcode, 
    SUM(r.quantity) AS Stock-In, 
    ISNULL(SUM(d.quantity), 0) AS Stock-out,
    SUM(r.quantity) - ISNULL(SUM(d.quantity), 0) AS Stock-Balance 
FROM cte LEFT JOIN Tblinkreceiving r ON cte.ink_code = r.ink_code
    LEFT JOIN Tblinkdelivery d ON cte.inkcode = d.inkcode
GROUP BY cte.inkcode