sql语句int型减null的问题
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO

ALTER proc [dbo].[sp_L_PurchaseSortAssetPlan]
@startDate datetime,
@endDate datetime
as
select SortAssetRfCode as 资产条码,SortAssetName as 资产名称,spec as 规格,units as 单位,StockAmount as 库存量,cCount as 消耗量,(cCount-case when aCount=null then 0 else aCount end)
as 计划购买数量,remark as 备注 from SortAsseta
right join (select SortAssetID,sum(sCount) as cCount from sortAssetDraw c
where sGetTime between @startDate and @endDate
group by SortAssetID) tab2
on a.SortAssetID = tab2.SortAssetID
left join (select SortAssetID,sum(Amount) as aCount from InStoreDetail a
left join InStore b on a.InStoreID = b.InStoreID
where InDate between @startDate and @endDate
group by SortAssetID) tab1
on a.SortAssetID = tab1.SortAssetID


这个存储过程中，我总得不到计划购买数量，原因是一个整数值减一个空值最后得NULL我想让空值做0，请大家帮个忙。

[解决办法]
isnull(字段,0),你直接付个默认值不就可以拉~~~
[解决办法]
用isnull函数，使用方法查帮助！！！
[解决办法]
NULL用is判断