如何使用sqlserver减去库存和销售

Question

这是递归表格式：

示例：

假设我有输入库存号是500而数量（销售数量）是5然后剩余库存是495，在下一种情况下，我在输入库存中出售其他项目必须是495而不是500，如果数量是6则489 ..

如何使用sqlserver计算？ 这是存储过程：

   select i.itemid,i.ItemName,i.EntryDate as 'Purchase Date',i.PurchaseRate as 'Purchase Amount',
 s.SaleDate,isnull(s.TotalPrice,0)as 'SalesAmount',sum(i.quantity)as 'Input Stock',s.Quantity,
 sum(i.quantity)-sum(ISNULL(s.quantity,0)) as 'Remaining Stock'
 from Inv_Medicine i
 left join Inv_Sales s on s.itemid=i.itemid
 group by i.itemid,i.ItemName,i.EntryDate,i.PurchaseRate,s.SaleDate,s.TotalPrice,s.Quantity

以上查询无法正常工作..有任何建议???

如何减去库存和销售？

我想要而不是500必须是495并且在495之后如果数量是6剩余库存489 ..取决于数据（动态输入库存和数量数据）

这里是Inv_Medicine和Inv_Sale表的格式和表： Inv_Medicine：

Inv_Medicine结构：

Inv_Sale：

Inv_Sale结构：

Answer 1

manoj，

DECLARE @date1 datetime='2017-01-25 04:48:03.830'
DECLARE @date2 datetime='2017-01-26 04:48:03.830'

 SELECT t1.*, CurrentStock = (isnull(t1.Quantity,0)-
  SUM(isnull(t2.salsesquantity,0)))+isnull(t1.salsesquantity,0),
  isnull(t1.salsesquantity,0)
  as SalesProductQunatity, RemainingStock = isnull(t1.Quantity,0)-
  SUM(isnull(t2.salsesquantity,0)) 

   FROM ( SELECT
  im.ItemName,im.PurchaseRate,Ins.SalesDate,ins.totalprice,ins.quantity
  as salsesquantity,im.Quantity , ROW_NUMBER()OVER( partition by
  Ins.itemId ORDER by ins.SalesDate) as ranknumbr  FROM 
  [dbo].[Inv_Medicine] IM LEFT JOIN [dbo].Inv_Sales Ins on
 IM.ItemId=Ins.ItemId ) t1

  INNER JOIN 
  ( SELECT
  im.ItemName,im.PurchaseRate,Ins.SalesDate,ins.totalprice,ins.quantity
 as salsesquantity,im.Quantity , ROW_NUMBER()OVER( partition by
 Ins.itemId ORDER by ins.SalesDate) as ranknumbr  FROM 
  [dbo].[Inv_Medicine] IM LEFT JOIN [dbo].Inv_Sales Ins on
  IM.ItemId=Ins.ItemId  ) as t2  



 ON t1.ranknumbr >= t2.ranknumbr AND t1.ItemName=t2.ItemName 
 WHERE t1.SalesDate BETWEEN @date1 AND @date2
 GROUP BY
  t1.ranknumbr,
 t1.SalesDate,t1.ItemName,t1.PurchaseRate,t1.totalprice,t1.salsesquantity,
 t1.Quantity,t2.    Quantity

   ORDER by t1.ItemName DESC

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