库存控制决定因素

Question

我有一张桌子有库存，库存和（库存 - 库存）。我希望根据（库存 - 库存）产生的程序计算进出库存之间的差异。我是

Stock In |Stock Out|(Stock In - Stock Out)|

500      |    50   |    450               |

450      |    100  |    350               |

我遇到的问题是Stock Out是从500的原始库存中扣除。

结果，我有这个：

Stock In |Stock Out|(Stock In - Stock Out)|

500      |    50   |    450               |

0        |    100  |    400               |

0        |    150  |    350               |

我希望从差异的结果中扣除它。

这是我的问题：

SELECT  Product_Code,  SUM(Stock In - Stock Out) AS Stock_Balance
FROM Daily_Stock_Balance
GROUP BY  Product_Code;

这是我从上述查询得到的结果：

     Stock In |Stock Out|Stock Balance|

     500      |    50   |    450      |

              |    100  |    100      |

              |    150  |   100       |

下面是我的真实数据库表

任何帮助都将受到高度赞赏。

Answer 1

如何总结相关列：

SELECT Testx.dispatchdate,
       Testx.stockin,
       Testx.stockout,
       (SELECT SUM(stockin)
        FROM   Testx a
        WHERE  a.dispatchdate <= Testx.dispatchdate) AS SumIn,
       (SELECT SUM(stockout)
        FROM   Testx a
        WHERE  a.dispatchdate <= Testx.dispatchdate) AS SumOut,
       [sumin] - [sumout]                            AS Balance
FROM   Testx
ORDER  BY Testx.dispatchdate;