Question

表 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

表 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

此处我们需要在销售后从 PURCHASE表查看剩余物品及其库存价值（PQty * Rate）。（关闭股票）
选择查询应该在此处执行此过程。
购买表的PQty应根据 SALES以PDATE的升序排序逐个，从上到下扣除表格 SQty 一个接一个，从上到下按日期升序排列。
PURCHASE表的PQty不应该变为0（零）当前。
如果PQty达到零，则从列表中 PURCHASE Table PQty的下一行扣除 SALES 的剩余SQty。
如果没有更多行可用，则最后一行可能具有负值。
表之间的条件已完成 WHERE SALES.ItemName LIKE PURCHASE.ItemName

表 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

如何解决这个问题？

Answer 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

Sql Server：选择查询并逐行计算行

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