日期:2014-05-17 浏览次数:20630 次
create table tb(col1 varchar(1),col2 int)
insert into tb
select 'A',2005 union all
select 'A',2005 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2008
declare @max int,@min int
select @max=max(col2),@min=min(col2) from tb
select @min+number
from master..spt_values left join tb on @min+number=col2
where type='p' and @min+number<@max and col2 is null
/*
-----------
2006
(1 row(s) affected)
--1有局限性,当间隔为两年时有问题
create table test(a char(1),b int)
insert into test select 'A',2003 union all
select 'A',2005 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2008
;with cte
as
(
select a,b,row_number() over(order by b) id,max(b) max_val from test group by a ,b
)
select c.b+1 as min_lose from cte c
where not exists(select 1 from cte c1 where c.id=c1.id+1 and c.b=c1.b+1) and (c.id+1) <(select max(id) from cte)
--2 直接建个有序的年代数据,然后与此比较
if object_id('tb')is not null
drop table tb
go
create table tb(cname varchar(1),cdate int)
insert into tb
select 'A',2005 union all
select 'A',2005 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2007 union all
select 'A',2008
declare @maxdate int,@mindate int
set @maxdate=(select max(cdate) from tb)
set @mindate=(select min(cdate) from tb)
select @mindate+number as cdate
from master..spt_values
where type='p' and number>0 and @mindate+number<@maxdate and @mindate+number not in(select cdate from tb)