求一个递归汇总的SQL语句
原数据
年 月 产品 未出库数量
2013 11 A 100
2013 12 A 150
2014 1 A 300
2013 10 B 1000
2013 11 B 1500
2013 12 B 3001
要求得出下面结果:
年 月 产品 当月为止剩余未出库数量
2013 11 A 100
2013 12 A 250
2013 1 A 550
2013 10 B 1000
2013 11 B 2500
2013 12 B 5501
谢谢
----------------------------------------------------------------
-- Author :DBA_Huangzj(發糞塗牆)
-- Date :2014-01-15 14:52:01
-- Version:
-- Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64)
--Dec 28 2012 20:23:12
--Copyright (c) Microsoft Corporation
--Enterprise Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
--
----------------------------------------------------------------
--> 测试数据：[huang]
if object_id('[huang]') is not null drop table [huang]
go
create table [huang]([年] int,[月] int,[产品] varchar(1),[未出库数量] int)
insert [huang]
select 2013,11,'A',100 union all
select 2013,12,'A',150 union all
select 2014,1,'A',300 union all
select 2013,10,'B',1000 union all
select 2013,11,'B',1500 union all
select 2013,12,'B',3001
--------------开始查询--------------------------
;WITH cte AS (
select *,ROW_NUMBER()OVER(PARTITION BY [产品] ORDER BY [年],[月]) id
from [huang] )
SELECT [年],[月],[产品],ISNULL((SELECT SUM([未出库数量] ) FROM cte b WHERE a.id>b.id AND a.[产品]=b.[产品]),0)[未出库数量]
FROM cte a
ORDER BY [产品]
----------------结果----------------------------
/*
年 月 产品 未出库数量
----------- ----------- ---- -----------
2013 11 A 0
2013 12 A 100
2014 1 A 250
2013 10 B 0
2013 11 B 1000
2013 12 B 2500
*/
