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        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 id from wedonet_keyword where title='三极管的工作原理' update wedonet_keyword set mycount=mycount+1 select count(*) from [wedonet_video] where isdel=0 and ispass=1 and title like '%三极管的工作原理%' select top 30 id,classid,preimg,title from [wedonet_video] where isdel=0 and ispass=1 and title like '%三极管的工作原理%' select top 4 id,classid,preimg,title from [wedonet_video] where isdel=0 and ispass=1 and cid=8 and classid<>-2 and isgood=1 order by istop desc,cls asc,id desc select top 5 id,classid,title from [wedonet_video] where isdel=0 and ispass=1 and cid=8 and classid<>-2 order by istop desc,cls asc,id desc select top 8 id,classid,title from [wedonet_doc] where isdel=0 and ispass=1 and cid=4 and classid<>-2 and isgood=1 order by istop desc,cls asc,id desc select top 10 id,title from [wedonet_keyword] order by mycount desc