如何计算特定日期或更好的运行总数？

Question

我想在完成尽可能多的订单后计算可以完成哪些订单以及缺少哪些日期（差异）。按FEFO的顺序选择。

在考虑问题时，我认为基于股票日期和订单的某种运行总和将是一种方法。基于Calculate running total / running balance和其他类似的线程，它似乎很适合这个问题 - 但我对其他解决方案持开放态度。

示例代码

DECLARE @stockTable TABLE (
    BATCH_NUM nvarchar(16),
    QUANTITY int, 
    DATE_OUTGO DATE
)

DECLARE @orderTable TABLE (
    ORDER_ID int,
    QUANTITY int, 
    DATE_OUTGO DATE
)

INSERT INTO @stockTable (BATCH_NUM, QUANTITY, DATE_OUTGO)
VALUES 
('1000', 10, '2017-08-25'),
('1001', 20, '2017-08-26'),
('1002', 10, '2017-08-27')

INSERT INTO @orderTable (ORDER_ID, QUANTITY, DATE_OUTGO)
VALUES
(1, 10, '2017-08-25'),
(1, 12, '2017-08-25'),
(2, 10, '2017-08-26'),
(3, 10, '2017-08-26'),
(4, 16, '2017-08-26')

SELECT 
    DATE_OUTGO,
    SUM(RunningTotal) AS DIFF
FROM (
    SELECT  
        orderTable.DATE_OUTGO AS DATE_OUTGO,
        RunningTotal = SUM(stockTable.QUANTITY - orderTable.QUANTITY ) OVER 
                       (ORDER BY stockTable.DATE_OUTGO ROWS UNBOUNDED PRECEDING)
    FROM 
        @orderTable orderTable
        INNER JOIN @stockTable stockTable 
           ON stockTable.DATE_OUTGO >= orderTable.DATE_OUTGO 
    GROUP BY 
        orderTable.DATE_OUTGO, 
        stockTable.DATE_OUTGO, 
        stockTable.QUANTITY, 
        orderTable.QUANTITY
    ) A
GROUP BY DATE_OUTGO

结果

The correct result would look like this.
-------------------------
| OT_DATE_OUTGO | DIFF  |
-------------------------
| 2017-08-25    | 0     |
-------------------------
| 2017-08-26    | -18   |
-------------------------

My result currently looks like this.
-------------------------
| OT_DATE_OUTGO | DIFF  |
-------------------------
| 2017-08-25    | 80    |
-------------------------
| 2017-08-26    | 106   |
-------------------------

我已经同时解决了项目编号，不同需求等复杂问题（仅使用确切日期和日期或更好）等，以尽可能简化核心问题。

编辑1：

更新了表和结果中的行（正确且使用原始查询）。 第一个答案在2017-08-25而不是0给出-12的差异。但2017-08-26是正确的。

Answer 1

您可以使用以下查询：

;WITH ORDER_RUN AS (
   SELECT SUM(SUM(QUANTITY)) OVER (ORDER BY DATE_OUTGO)  AS ORDER_RUNTOTAL,
          DATE_OUTGO
   FROM @orderTable
   GROUP BY DATE_OUTGO
), STOCK_RUN AS (
   SELECT SUM(SUM(QUANTITY)) OVER (ORDER BY DATE_OUTGO) AS STOCK_RUNTOTAL, 
          DATE_OUTGO
   FROM @stockTable
   GROUP BY DATE_OUTGO
)
SELECT ORR.DATE_OUTGO AS OT_DATE_OUTGO,
       X.STOCK_RUNTOTAL - ORDER_RUNTOTAL  AS DIFF
FROM ORDER_RUN AS ORR
OUTER APPLY (
   SELECT TOP 1 STOCK_RUNTOTAL
   FROM STOCK_RUN AS SR
   WHERE SR.DATE_OUTGO <= ORR.DATE_OUTGO
   ORDER BY SR.DATE_OUTGO DESC) AS X

第一个CTE计算订单运行总计，而第二个CTE计算库存运行总计。该查询使用OUTER APPLY来使股票运行总计直到当前订单的日期。

修改

如果您想要使用与订单日期相关的日期库存，那么只需替换：

WHERE SR.DATE_OUTGO <= ORR.DATE_OUTGO

带

WHERE STOCK_RUNTOTAL <= ORDER_RUNTOTAL

在OUTER APPLY操作中

。

编辑2：

以下改进的查询应该最终解决问题：

;WITH ORDER_RUN AS (
   SELECT SUM(SUM(QUANTITY)) OVER (ORDER BY DATE_OUTGO)  AS ORDER_RUNTOTAL,
          DATE_OUTGO
   FROM @orderTable
   GROUP BY DATE_OUTGO
), STOCK_RUN AS (
   SELECT SUM(SUM(QUANTITY)) OVER (ORDER BY DATE_OUTGO) AS STOCK_RUNTOTAL, 
          SUM(SUM(QUANTITY)) OVER () AS TOTAL_STOCK,
          DATE_OUTGO
   FROM @stockTable
   GROUP BY DATE_OUTGO
)
SELECT ORR.DATE_OUTGO AS OT_DATE_OUTGO, 
       CASE 
          WHEN X.STOCK_RUNTOTAL - ORDER_RUNTOTAL >= 0 THEN 0  
          ELSE X.STOCK_RUNTOTAL - ORDER_RUNTOTAL
       END AS DIFF
FROM ORDER_RUN AS ORR
OUTER APPLY (
   SELECT TOP 1 STOCK_RUNTOTAL
   FROM STOCK_RUN AS SR
   WHERE STOCK_RUNTOTAL >= ORDER_RUNTOTAL -- Stop if stock quantity has exceeded order quantity
         OR
         STOCK_RUNTOTAL = TOTAL_STOCK     -- Stop if the end of stock has been reached
   ORDER BY SR.DATE_OUTGO) AS X