有一個表 #t 如下:
產品id 產品名稱 購進數量 購進單價 購進日期
1 aa 100 10 2007-1-1
1 aa 50 20 2007-1-15
1 aa 100 22 2007-1-20
有一個表 #p 如下:
產品id 產品名稱 銷售數量 銷售日期
1 aa 50 2007-1-2
1 aa 60 2007-1-16
1 aa 10 2007-1-21
1 aa 40 2007-1-22
--要產生下面的統計結果
產品id 產品名稱 銷售數量 銷售成本 銷售日期
1 aa 50 50*10(購進單價) 2007-1-2
1 aa 60 50*10+10*20 2007-1-16
1 aa 10 10*20 2007-1-21
1 aa 40 30*20+10*22 2007-1-22
就是所謂的先購進的先銷售
--建立環境
create table #t
(
pid int,
pname varchar(10),
jsum int,
jpri int,
jdate datetime
)
create table #p
(
pid int,
pname varchar(10),
xnum int,
xdate smalldatetime
)
insert into #t select 1, 'aa', 100, 10, '2007-1-1'
insert into #t select 1, 'aa', 50, 20, '2007-1-15'
insert into #t select 1, 'aa', 100, 22, '2007-1-20'
insert into #p select 1, 'aa', 50, '2007-1-2'
insert into #p select 1, 'aa', 60, '2007-1-16'
insert into #p select 1, 'aa', 10, '2007-1-21'
insert into #p select 1, 'aa', 40, '2007-1-22'
--語句
select pp.pid,pp.pname,pp.xnum,
cb = sum(case when qxnum >= qjnum and xxnum <= xjnum then xnum * jpri
when qxnum >= qjnum and xxnum >= xjnum then (xjnum - qxnum) * jpri
when qxnum <= qjnum and xxnum <= xjnum then (xxnum - qjnum) * jpri
end),
pp.xdate
from
(select pid,pname,jsum,
qjnum = (select isnull(sum(jsum),0) from #t where pid = t.pid and jdate < t.jdate),
xjnum = (select sum(jsum) from #t where pid = t.pid and jdate <= t.jdate),
jpri,jdate
from #t t) tt,
(select pid,pname,xnum,xdate,
qxnum = (select isnull(sum(xnum),0) from #p where pid = p.pid and xdate < p.xdate),
xxnum = (select sum(xnum) from #p where pid = p.pid and xdate <= p.xdate)
from #p p ) pp
where qxnum between qjnum and xjnum or xxnum between qjnum and xjnum
group by pp.pid,pp.pname,pp.xnum,pp.xdate
order by xdate
--結果
pid pname xnum cb xdate
----------- ---------- ----------- ----------- -----------------------
1 aa 50 500 2007-01-02 00:00:00
1 aa 60 700 2007-01-16 00:00:00
1 aa 10 200 2007-01-21 00:00:00
1 aa 40 820 2007-01-22 00:00:00
(4 行受影響)
--刪除環境
drop table #t
drop table #p
(Win2003 + SQL Server 2005 下測試通過)