Question

我需要帮助处理对我来说似乎很复杂的事情。

我创建了一个查询来创建一个tbl1，它是表Item和Warehouse的笛卡尔积。它让我回到所有仓库中的所有物品：

SELECT i.ItemID, w.WarehouseID
FROM Item i, Warehouse w

我做了第二个查询（tbl2），在那里我检查上一个或等于变量日期（@datevar）的最后一个文档的日期，其数量规则是1（PhysicalQtyRule = 1），这是通过Item和Warehouse获得的来自StockHistory表

SELECT MAX(CreateDate) AS [DATE1], ItemID, Quantity, WarehouseID
FROM StockHistory
WHERE PhysicalQtyRule = 1 AND CreateDate <= @datevar
GROUP BY ItemID, Quantity, WarehouseID

现在，我需要更多三个步骤：

构建第三个包含每个项目的表格并存储数量之和，但数量规则为2（PhysicalQtyRule = 2）和tbl2.date之间的日期（如果存在）和变量@datevar的日期，从StockHistory表中获得。这样的事情：
```
SELECT ItemID, WarehouseID, SUM(Quantity)
FROM StockHistory
WHERE PhysicalQtyRule = 2 AND CreateDate > tbl2.DATE1 --If exists
AND CreateDate <= @datevar
GROUP BY ItemID, WarehouseID
```
构建第四个包含每个项目的表并仓库数量的总和，但数量规则是3（PhysicalQtyRule = 3）和tbl2.date（如果有）之间的日期和变量@datevar的日期，从StockHistory表中获得。这样的事情：
```
SELECT ItemID, WarehouseID, SUM(Quantity)
FROM StockHistory
WHERE PhysicalQtyRule = 3 AND CreateDate > tbl2.DATE1 --If exists
AND CreateDate <= @datevar
GROUP BY ItemID, WarehouseID
```

根据第一个表创建一个最终表格，其中包含一个总和数量列，如下所示：

SELECT i.ItemID, w.WarehouseID, tbl2.Quantity + tbl3.Quantity – tbl4.Quantity AS [Qty]
FROM Item i, Warehouse w

我不知道是否需要游标（对我而言是新的）或多个查询，但重要的是最佳性能，因为我的StockHistory表有数百万条记录。

任何人都可以帮助我吗？谢谢！

一些示例数据，仅适用于一个项目和一个仓库：

+--------+-------------+------------+-----------------+----------+
| ItemID | WarehouseID | CreateDate | PhysicalQtyRule | Quantity | Balance | comments 
+--------+-------------+------------+-----------------+----------+
|   1234 |          11 | 2013-03-25 |               2 |       35 |      35 | Rule 2 = In 
|   1234 |          11 | 2013-03-28 |               3 |       30 |       5 | Rule 3 = Out
|   1234 |          11 | 2013-04-01 |               1 |        3 |       3 | Rule 1 = Reset
|   1234 |          11 | 2013-07-12 |               2 |       40 |      43 | Rule 2 = In 
|   1234 |          11 | 2013-09-05 |               3 |       20 |      23 | Rule 3 = Out
|   1234 |          11 | 2013-12-31 |               1 |       25 |      25 | Rule 1 =  Reset
|   1234 |          11 | 2014-01-09 |               3 |       11 |      14 | Rule 3 = Out
|   1234 |          11 | 2014-01-16 |               3 |        6 |       8 | Rule 3 = Out

我想知道任何变量日期的余额。

Answer 1

如果没有您的数据，我无法对此进行测试，但我相信这应该是您的解决方案。

SELECT i.ItemID
    ,w.WarehouseID
    ,[Qty] = tbl2.Quantity + tbl3.Quantity – tbl4.Quantity
FROM Item i
CROSS JOIN Warehouse w
OUTER APPLY (
SELECT [DATE1] = MAX(sh.CreateDate)
        ,sh.ItemID
        ,sh.Quantity
        ,sh.WarehouseID
FROM StockHistory sh
WHERE sh.PhysicalQtyRule = 1 AND sh.CreateDate <= @datevar
AND i.ItemID = sh.ItemID
    AND w.WarehouseID = sh.WarehouseID
GROUP BY sh.ItemID, sh.Quantity, sh.WarehouseID ) tbl2
OUTER APPLY (
SELECT sh.ItemID
    ,sh.WarehouseID
    ,[Quantity] = SUM(sh.Quantity)
FROM StockHistory sh
WHERE sh.PhysicalQtyRule = 2 AND sh.CreateDate > tbl2.DATE1 --If exists
AND sh.CreateDate <= @datevar AND i.ItemID = sh.ItemID
AND w.WarehouseID = sh.WarehouseID
GROUP BY sh.ItemID, sh.WarehouseID ) tbl3
OUTER APPLY (
SELECT sh.ItemID
    ,sh.WarehouseID
    ,[Quantity] = SUM(sh.Quantity)
FROM StockHistory sh
WHERE sh.PhysicalQtyRule = 3 AND sh.CreateDate > tbl2.DATE1 --If exists
AND sh.CreateDate <= @datevar AND i.ItemID = sh.ItemID
    AND w.WarehouseID = sh.WarehouseID
GROUP BY sh.ItemID, sh.WarehouseID ) tbl4

多个sql查询还是Cursor？

1 个答案: