SQL SERVER过滤重复查询，在Browser表中过滤重复的IP：
select * from Browser a where not exists (select 1 from Browser where Ip = a .Ip and id < a.id )SQL SERVER过滤重复查询，在Browser表中过滤重复的IP：
select * from Browser a where not exists (select 1 from Browser where Ip = a .Ip and id < a.id )