mysql - Mysqli num rows shows 0 result -

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i'm having 2 queries fetch return max voted , max voted down, first query returns 0 result , second return results indeed have quad checked results in database first return 0. have spent time debugging didn't come result. maybe 1 eye can't find wanted share eyes can find maybe or ? :) .

my first code of top votes query --------> returns 0

select m.id ,cm.id ,cm.userid,cm.replyto,m.username ,cm.message,cm.edited,cm.date,cm.voteup,cm.votedown   chat_messages cm   inner join members m  on m.id =cm.userid  cm.voteup - cm.votedown = (select max(voteup - votedown )                                    chat_messages                                     deleted != 1                                    , voteup - votedown >= 5   )  ,  cm.room_id = 1       order cm.votedown asc,cm.voteup desc,cm.id   limit 1

--------> gives me 0

and second top down votes query--------> works; i'm getting result

 select m.id ,cm.id ,cm.userid,cm.replyto,m.username ,cm.message,cm.edited,cm.date,cm.voteup,cm.votedown    chat_messages cm    inner join members m  on m.id =cm.userid   cm.votedown - cm.voteup = (select max(votedown - voteup)                                    chat_messages                                     deleted != 1                                     , votedown - voteup >= 5)   ,  cm.room_id = 1    order cm.voteup asc, cm.votedown desc, cm.id   limit 1

any 1 have idea ?

edit:

i'm getting result if voteup - votedown >= 7 , here i'm getting foul , because in query have >=5 wonder why ?

edit2:

my database schema

  id    int(11) auto_increment     userid    int(11)    replyto   int(11)   message   text    utf8_general_ci    room_id   int(11)    edited    text    utf8_general_ci   deleted   int(1)   date  datetime   date_edited   datetime   voteup    int(11)   votedown  int(11)


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