原文:在论坛中出现的比较难的sql问题:45(用户在线登陆时间的小时、分钟计算问题)
最近,在论坛中,遇到了不少比较难的sql问题,虽然自己都能解决,但发现过几天后,就记不起来了,也忘记解决的方法了。
所以,觉得有必要记录下来,这样以后再次碰到这类问题,也能从中获取解答的思路。
如何解决用户在线登陆时间——的小时和分钟计算问题。
http://bbs.csdn.net/topics/390613823
我想得到用户在线时长,格式是:08:00和08:43这种格式的在线时长结果。
我自己尝试查了sql的文档,也百度了很多。但是没有这方面的应用。
我自己也尝试写了很多但是不行。
我只能得到在线的总分钟数,或者总秒数。无法弄成想要的格式。
这是我的代码:
select ta.[user],(DATEDIFF(mi,ta.time,tb.time)) from
(select * from T1 where T1.operate='Login') as ta
inner join
(select * from T1 where T1.operate='Logout') as tb
on ta.[user]=tb.[user]
------------------------------------
或者这样写:
select ta.[user], cast(datediff(hour, ta.time, tb.time) as varchar) + ':' + cast(DATEDIFF(MINUTE, ta.time, tb.time) as varchar)
from
(select [user], [time] from T1 where [operate] = 'login') as ta
inner join
(select [user], [time] from T1 where [operate] = 'logout') as tb
on ta.[user] = tb.[user];
两种写法都无法实现想要的结果。请求大神指导下,帮忙给出一种解决方法。
我测试完,发效果图。
我的解法:
方法1:
-
drop table t1
-
-
create table T1
-
(
-
[user] varchar(30),
-
operate varchar(10),
-
time datetime
-
)
-
-
insert into T1
-
select 'LiMing','Login','2010/10/24 8:03' union all
-
select 'WangYi','Login','2010/10/24 8:14' union all
-
select 'WangYi','Logout','2010/10/24 16:14' union all
-
select 'LiMing','Logout','2010/10/24 16:14'
-
-
-
select [user],
-
cast(cast(round(interval * 1.0 / 60,0,1) as int) as varchar) + ':' +
-
case when interval * 1.0 % 60 <> 0
-
then cast(cast(round(interval * 1.0 % 60,0,1) as int) as varchar)
-
else '00'
-
end
-
from
-
(
-
select T1.[user],
-
DATEDIFF(MINUTE,t1.time,t2.time) as interval
-
-
from T1
-
inner join T1 t2
-
on t1.[user] = t2.[user]
-
and t1.operate = 'login'
-
and t2.operate = 'logout'
-
)a
-
/*
-
user (无列名)
-
LiMing 8:11
-
WangYi 8:00
-
*/
方法2:
-
--方法2.
-
select [user],
-
convert(varchar(5),DATEADD(MINUTE,interval,time),114)
-
from
-
(
-
select T1.[user],
-
convert(varchar(10),t1.time,120) as time,
-
DATEDIFF(MINUTE,t1.time,t2.time) as interval
-
-
from T1
-
inner join T1 t2
-
on t1.[user] = t2.[user]
-
and t1.operate = 'login'
-
and t2.operate = 'logout'
-
)a
-
/*
-
user (无列名)
-
LiMing 08:11
-
WangYi 08:00
-
*/
所以,觉得有必要记录下来,这样以后再次碰到这类问题,也能从中获取解答的思路。