update wedonet_user set user_atime=GetDate() where id=0 update wedonet_user set isonline=0 where isonline=1 and datediff(n,user_atime,GetDate())>20 select top 1 * from [wedonet_download] select id,classid,tags,descrip,content,title from [wedonet_download] where isdel=0 and ispass=1 and classid=974 and id=514 update [wedonet_download] set hits=hits+1 where id=514 select top 10 id,title from [wedonet_keyword] order by mycount desc