試合結果

select tno,bno from tournament where sel=51 and (playdt::date)='2017/7/18' and tbno=1 and a.bno is null order by playdt
ERROR: missing FROM-clause entry for table "a" LINE 1: ...51 and (playdt::date)='2017/7/18' and tbno=1 and a.bno is n... ^