How to calculate the total for a certain date or better?

Question

I would like to calculate which orders can be completed and which dates are missing ( diff ) after completing as many orders as possible at the moment. Selected in FEFO order .

When I think of a problem, I think that some running amount based on the dates of stocks and orders will be one way. Based on Calculate the current total / current balance and other similar flows, it seems suitable for this problem - but I am open to other solutions.

Code example

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

results

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   |
-------------------------

I chose difficulties, such as item numbers, different requirements at the same time (using the exact date and date or better), etc., in order to simplify the main problem as much as possible.

1:

( ). -12 2017-08-25 0. 2017-08-26 .

Answer 1

:

;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

CTE , CTE . OUTER APPLY, , .

Edit:

, , :

WHERE SR.DATE_OUTGO <= ORR.DATE_OUTGO

WHERE STOCK_RUNTOTAL <= ORDER_RUNTOTAL

OUTER APPLY.

2:

, , :

;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