复杂年月处理.sql

--定义基本数字表
declare @T1 table(代码 int,名称 varchar(10),参加时间 datetime,终止时间 datetime)
insert into @T1
   select 12,'单位1','2003/04/01','2004/05/01'
   union all select 22,'单位2','2001/02/01','2003/02/01'
   union all select 42,'单位3','2000/04/01','2003/05/01'
   union all select 25,'单位5','2003/04/01','2003/05/01'

--定义年表
declare @NB table(代码 int,名称 varchar(10),年份 int)
insert into @NB
   select 12,'单位1',2003
   union all select 12,'单位1',2004
   union all select 22,'单位2',2001
   union all select 22,'单位2',2002
   union all select 22,'单位2',2003

--定义月表
declare @YB table(代码 int,名称 varchar(10),年份 int,月份 varchar(2))
insert into @YB
   select 12,'单位1',2003,'04'
   union all select 22,'单位2',2001,'01'
   union all select 22,'单位2',2001,'12'

--为年表+月表数据处理准备临时表
select top 8246 y=identity(int,1753,1)
into #tby from
   (select id from syscolumns) a,
   (select id from syscolumns) b,
   (select id from syscolumns) c

--为月表数据处理准备临时表
select top 12 m=identity(int,1,1)
into #tbm from syscolumns

/*--数据处理--*/
--年表数据处理
select a.*
from(
select a.代码,a.名称,年份=b.y
from @T1 a,#tby b
where b.y between year(参加时间) and year(终止时间)
) a left join @NB b on a.代码=b.代码 and a.年份=b.年份
where b.代码 is null

--月表数据处理
select a.*
from(
select a.代码,a.名称,年份=b.y,月份=right('00'+cast(c.m as varchar),2)
from @T1 a,#tby b,#tbm c
where b.y*100+c.m between convert(varchar(6),参加时间,112)
   and convert(varchar(6),终止时间,112)
) a left join @YB b on a.代码=b.代码 and a.年份=b.年份 and a.月份=b.月份
where b.代码 is null
order by a.代码,a.名称,a.年份,a.月份

--删除数据处理临时表
drop table #tby,#tbm

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