如何高效的查询是否存在这样的记录:最新的符合特定条件的两条记录是上一个小时和上上一个小时的数据?

[叶子哟]

如有表user,其中字段:id,userid和createtime
id是自增量
userid是条件
createtime是时间型字段
如何判断某个userid最新的两条记录是连续一个小时一条的?

[dawugui]

[Quote=引用楼主 matq2008 的帖子:]
如有表user,其中字段:id,userid和createtime
id是自增量
userid是条件
createtime是时间型字段
如何判断某个userid最新的两条记录是连续一个小时一条的?
[/Quote]

select m.* , n.* from
(select * , px = (select count(1) from [user] where userid = t.userid and createtime > t.createtime) + 1 from [user] t) m,
(select * , px = (select count(1) from [user] where userid = t.userid and createtime > t.createtime) + 1 from [user] t) n
where m.userid = n.userid and m.px = 1 and n.px = 2 and datediff(hh, n.createtime , m.createtime) = 1

[viva369]

create table #t
(
	id int identity(1,1),
	userid nvarchar(60),
	createtime datetime
)

insert #t select 'A',getdate()
insert #t select 'A',getdate()
go
select userid,case when datediff(mi,min(createtime),max(createtime))>60 then '是' else '否' end
from
(
select top 2 * from #t as aa
where userid = 'A' order by createtime desc
)tbl
group by userid

[viva369]

写错了

select userid,case when datediff(mi,min(createtime),max(createtime))>60 then '否' else '是' end
from
(
select top 2 * from #t as aa
where userid = 'A' order by createtime desc
)tbl
group by userid