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给个例子你先看看
--库存先进先出简单例子:
create table t(
id int identity(1,1),
name varchar(50),--商品名称
j int, --入库数量
c int, --出库数量
jdate datetime --入库时间
)
insert into t(name,j,c,jdate) select 'A',100,0,'2007-12-01'
insert into t(name,j,c,jdate) select 'A',200,0,'2008-01-07'
insert into t(name,j,c,jdate) select 'B',320,0,'2007-12-21'
insert into t(name,j,c,jdate) select 'A',100,0,'2008-01-15'
insert into t(name,j,c,jdate) select 'B',90,0,'2008-02-03'
insert into t(name,j,c,jdate) select 'A',460,0,'2008-02-01'
insert into t(name,j,c,jdate) select 'A',510,0,'2008-03-01'
go
create proc wsp
@name varchar(50),--商品名称
@cost int --销售量
as
--先得出该货物的库存是否够
declare @spare float --剩余库存
select @spare=sum(j)-sum(c) from t where name=@name
if(@spare>=@cost)
begin
--根据入库日期采用先进先出原则对货物的库存进行处理
update t set c=
case when (select @cost-isnull(sum(j),0)+isnull(sum(c),0) from t where name=@name and jdate<=a.jdate and j!=c)>=0
then a.j
else
case when (select @cost-isnull(sum(j),0)+isnull(sum(c),0) from t where name=@name and jdate<a.jdate and j!=c)<0 then 0
else (select @cost-isnull(sum(j),0)+isnull(sum(c),0)+a.c from t where name=@name and jdate<a.jdate and j!=c)
end
end
from t a where name=@name and j!=c
end
else
raiserror('库存不足',16,1)
return
go
--测试:
exec wsp @name='A',@cost=180
select * from t
--drop table t
--drop proc wsp
create table tbA(下单日期 datetime,产品型号 nvarchar(10),下单数量 int)
insert into tbA select '2011-09-01','AT001',10
insert into tbA select '2011-09-05','AT001',20
insert into tbA select '2011-09-13','AT001',30
insert into tbA select '2011-09-02','AT002',20
insert into tbA select '2011-09-13','AT002',30
create table tbB(入库日期 datetime,产品型号 nvarchar(10),入库数量 int)
insert into tbB select '2011-09-11','AT001',12
insert into tbB select '2011-09-13','AT001',6
insert into tbB select '2011-09-13','AT002',28
go
select 入库日期,产品型号,
(select sum(下单数量) from tba where 产品型号=b.产品型号 and 下单日期<=b.入库日期)-
(select sum(入库数量) from tbb where 产品型号=b.产品型号 and 入库日期<=b.入库日期)下单未入库 from tbb b
/*
入库日期 产品型号 下单未入库
----------------------- ---------- -----------
2011-09-11 00:00:00.000 AT001 18
2011-09-13 00:00:00.000 AT001 42
2011-09-13 00:00:00.000 AT002 22
(3 行受影响)
*/
go
drop table tba,tbb