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桌子 PURCHASE(PDate, ItemName, PQty, Rate)

PDate       | ItemName     | PQty  | Rate
============================================
01-04-2015  | Mobile Phone | 06    | 05,000
01-04-2015  | Laptop       | 07    | 30,000
03-04-2015  | Mobile Phone | 03    | 06,000
04-04-2015  | Mobile Phone | 08    | 07,000
04-04-2015  | Laptop       | 03    | 40,000
05-04-2015  | Mobile Phone | 05    | 04,000

桌子 SALES(SDate, ItemName, SQty)

SDate       | ItemName     | SQty
=================================
02-04-2015  | Mobile Phone | 02
03-04-2015  | Laptop       | 03
03-04-2015  | Mobile Phone | 05
04-04-2015  | Mobile Phone | 07
04-04-2015  | Laptop       | 03
06-04-2015  | Laptop       | 02

SQL

  • 在这里，我们需要在售后从PURCHASE Table中查看 Remaining Items 及其库存值 (PQty*Rate) 。(收盘)
  • 选择查询应该在此处执行该过程。
  • PURCHASE表的PQty 应该根据SALES 表的SQty一个一个，从上到下，从上到下按日期的升序，从上到下按PDate的升序扣除。
  • PURCHASE Table的 PQty不应该变成 0（零），这是当然的。
  • Incase，如果 PQty 达到零，则从列表中PURCHASE Table 的PQty的下一行中扣除剩余的SALES SQty。
  • 如果没有更多行可用，则最后一行可能为负值。
  • 表之间的条件完成WHERE SALES.ItemName LIKE PURCHASE.ItemName

桌子 EXPECTED SELECT QUERY RESULT (Date, ItemName, Qty, Rate, ProductValue)

PDate       | ItemName     | PQty  | Rate   | ProductValue
===========================================================
01-04-2015  | Mobile Phone | 00    | 05,000 |      0.00
01-04-2015  | Laptop       | 00    | 30,000 |      0.00
03-04-2015  | Mobile Phone | 00    | 06,000 |      0.00
04-04-2015  | Mobile Phone | 03    | 07,000 | 21,000.00
04-04-2015  | Laptop       | 02    | 40,000 | 80,000.00
05-04-2015  | Mobile Phone | 05    | 04,000 | 20,000.00

我该如何解决这个问题？

4

1 回答 1

1 
SELECT PDate, ItemName, MPQty, PQty, ISNULL(SQty,0) AS SQty,
ISNULL((CASE WHEN SQTY>=PQty THEN 0 WHEN (SQty+MPQty)>PQty THEN PQty-SQty ELSE MPQty END),0) AS Qty, Rate,
(ISNULL((CASE WHEN SQTY>=PQty THEN 0 WHEN (SQty+MPQty)>PQty THEN PQty-SQty ELSE MPQty END),0)*Rate) AS PValue FROM
(SELECT P.PDate AS PDate, P.ItemName AS ItemName, P.PQty AS MPQty,
(SELECT SUM(P1.PQty) FROM PURCHASE P1 WHERE P1.ItemName=P.ItemName AND P1.PDate<=P.PDate) AS PQty,
(SELECT SUM(S1.SQty) FROM SALES S1 WHERE S1.ItemName=P.ItemName) AS SQty,    
P.Rate AS Rate FROM PURCHASE P)X ORDER BY Pdate
于 2015-10-16T05:20:26.613 回答