使用基于产品编号的SQL计算累积总和

Question

我编写了一个SQL查询，根据每个库存产品的剩余数量为客户分配产品。

即。如果OurQty = 55并且有70个未完成的订单分为5个客户（客户1 = 35，客户2 = 10，客户3 = 3，客户4 = 16，客户5 = 6）那么我的SQL查询将分配预留的产品数量按顺序连接每个客户，直到OurQty = 0或所有未完成的订单都已完成。

我的SQL查询：

WITH allocate 
     AS (SELECT rd.ponum                                  AS PONum, 
                od.orderline                              AS OrderLine, 
                rd.partnum                                AS PartNum, 
                p.partdescription                         AS PartDescription, 
                od.ordernum                               AS OrderNum, 
                rd.ourqty                                 AS OurQty, 
                od.number01                               AS Reserved, 
                rd.ourqty - od.number01                   AS NewOurQty, 
                c.custnum                                 AS CustNum, 
                c.name                                    AS Name, 
                ( rd.ourqty - Sum(od.number01) 
                                OVER ( 
                                  ORDER BY od.ordernum) ) AS CumulativeSum 
         FROM   dbo.rcvdtl AS rd WITH (nolock) 
                INNER JOIN dbo.part AS p WITH (nolock) 
                        ON rd.partnum = p.partnum 
                INNER JOIN dbo.orderdtl AS od WITH (nolock) 
                        ON rd.partnum = od.partnum 
                INNER JOIN dbo.orderhed AS oh WITH (nolock) 
                        ON od.ordernum = oh.ordernum 
                INNER JOIN dbo.customer AS c WITH (nolock) 
                        ON od.custnum = c.custnum 
         WHERE  ( rd.ponum = 73 ) 
                AND ( od.number01 > 0 ) 
                AND ( od.openline = 1 )) 
SELECT ponum, 
       orderline, 
       partnum, 
       partdescription, 
       ordernum, 
       ourqty, 
       reserved, 
       newourqty, 
       custnum, 
       name, 
       cumulativesum + reserved AS 'Left In Stock', 
       CASE 
         WHEN ( cumulativesum + reserved ) - reserved > 0 THEN reserved 
         ELSE ( CASE 
                  WHEN ( cumulativesum + reserved ) > 0 THEN 
                  ( cumulativesum + reserved ) 
                  ELSE 0 
                END ) 
       END                      AS Allocated 
FROM   allocate 

将'PartNum'指定为参数时，此方法可以正常工作。当我在没有指定'PartNum'的情况下查询表时会出现问题，因为该表包含多个'PartNums'，这会影响'CumulativeSum'的准确性，CumulativeSum用于检查是否（OurQty＆lt; CumulativeSum）并因此阻止分配没有实际存在的股票。

我最初的想法是将数据库表'PartNum'作为给定'PONum'的参数迭代地传递，然后将结果合并到我的应用程序上的一个数据集中。不幸的是，我使用的调用SQL查询的程序无法将'PartNum'作为参数传递给SQL查询。

因此，是否可以使用SQL计算表中每个PartNum的累积总和？

我正在使用Microsoft SQL Server 2012