ORDER BY is not working properly in MySQL -

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the following select query want order by transtype = 'i' , after transdate in ascending order. through query can transtype = 'i' record after not displays in proper sequence.

  select tranjectionid,date_format(transdate,'%d-%m-%y') transdate,motiamount,                              transtype,tranjection.partyid,item.itemname,gwt,loss,netwet,                               party.partyname,melting,westage,finewet,rhodium,amount,bhav                            tranjection,party,item                        party.partyid =  tranjection.partyid                        , item.itemid =  tranjection.itemid                          , tranjection.partyid = ".$partyid."                         order  (transtype = 'r') desc,                                    transdate

while doing order may as

order  case    when transtype = 'i' 0 else 1  end, transdate;

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