從更高的發貨數量從Id取出數量

Question

我在這裏是新的，我想出了一個場景，我必須從有調度的地方取出數量。例如我有下表

ID SKU QtyRec QTYDisp 
1 001A 50  0 
2 001A 50  10 
3 001A 50  20 
4 001A 50  0 

我已經拿出40數量。它應該首先從ID 3挑然後ID 2，然後從1或4由於調度量大於3然後2.但是，在我目前的情況是，從ID 1

DECLARE @Data table (Id int identity(1,1) 
, SKU varchar(10) 
, QtyRec INT 
,QtyDis INT 
) 
DECLARE @Qty int = 20 

INSERT @Data VALUES 
('001A', 50 ,0), 
('001A', 50,10), 
('001A', 50 ,20), 
('001A', 50,0) 


;WITH sumqty AS 
(
    SELECT *, SUM(QtyRec) OVER (PARTITION BY SKU ORDER BY Id) AS TotalQty FROM @Data 
) 
,takeqty AS (
SELECT *, 
CASE 
    WHEN @Qty >= TotalQty THEN QtyRec 
    ELSE @Qty - ISNULL(LAG(TotalQty) OVER (PARTITION BY SKU ORDER BY Id), 0) 
END AS TakeQty 
FROM sumqty 
) 
SELECT * FROM takeqty WHERE TakeQty > 0 

Answer 1

採摘40我想你應命令由QtyDis DESC，而不是由Id ASC：

DECLARE @Data TABLE 
    (
     Id INT IDENTITY(1, 1) , 
     SKU VARCHAR(10) , 
     QtyRec INT , 
     QtyDis INT 
    ) 
DECLARE @Qty INT = 70 

INSERT @Data 
VALUES ('001A', 50, 0), 
     ('001A', 50, 10), 
     ('001A', 50, 20), 
     ('001A', 50, 0); 
WITH sumqty 
      AS (SELECT * , 
         SUM(QtyRec - QtyDis) OVER (PARTITION BY SKU ORDER BY QtyDis DESC, Id) AS TotalQty 
       FROM  @Data 
      ), 
     takeqty 
      AS (SELECT * , 
         CASE WHEN @Qty > TotalQty THEN TotalQty 
          ELSE @Qty 
            - ISNULL(LAG(TotalQty) OVER (PARTITION BY SKU ORDER BY QtyDis DESC, Id), 
              0) 
         END AS TakeQty 
       FROM  sumqty 
      ) 
    SELECT * 
    FROM takeqty 
    WHERE TakeQty > 0 

輸出：

Id SKU  QtyRec QtyDis TotalQty TakeQty 
3 001A 50  20  30   30 
2 001A 50  10  70   40