语源科技BlogJava-死javahttp://www.blogjava.net/hzjun/zh-cnMon, 13 Apr 2026 10:45:19 GMTMon, 13 Apr 2026 10:45:19 GMT60oracle lead overhttp://www.blogjava.net/hzjun/archive/2010/01/30/311330.html胡章俊胡章俊Sat, 30 Jan 2010 08:18:00 GMThttp://www.blogjava.net/hzjun/archive/2010/01/30/311330.htmlhttp://www.blogjava.net/hzjun/comments/311330.htmlhttp://www.blogjava.net/hzjun/archive/2010/01/30/311330.html#Feedback0http://www.blogjava.net/hzjun/comments/commentRss/311330.htmlhttp://www.blogjava.net/hzjun/services/trackbacks/311330.html如login表有人员ID登陆或登出时间time求每天每次登陆登出一次的在线时间：
 

select login.id as人员ID ,login.status as 登陆登出状态
 login.time as 登陆或登出时间 ,
lead(login.time) over (partition by login.id,trunc(login.time) order by login.time)  as 下次登出或登出时间

from login login

这样状态是登陆的记录就会同时拥有登出的时间，这样两者一减就是在线时间了。
lead函数是取下一条记录，over (partition by login.id,trunc(login.time))如同对id,time分组，
order by login.time是按时间排序，这样可以知道是登陆登出的顺寻

胡章俊 2010-01-30 16:18 发表评论
]]>报到http://www.blogjava.net/hzjun/archive/2009/08/14/291134.html胡章俊胡章俊Fri, 14 Aug 2009 03:46:00 GMThttp://www.blogjava.net/hzjun/archive/2009/08/14/291134.htmlhttp://www.blogjava.net/hzjun/comments/291134.htmlhttp://www.blogjava.net/hzjun/archive/2009/08/14/291134.html#Feedback0http://www.blogjava.net/hzjun/comments/commentRss/291134.htmlhttp://www.blogjava.net/hzjun/services/trackbacks/291134.html

胡章俊 2009-08-14 11:46 发表评论
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