SELECT StuID FROM Student WHERE sex  =  'M' EXCEPT SELECT StuID FROM Sportsinfo WHERE sportname  =  "Football"
Show all male student ids who don't play football.
SELECT StuID FROM Student WHERE sex = 'M ' EXCEPT SELECT StuID FROM Sportsinfo WHERE sportname = `` Football ''
select stuid from student where sex = value except select stuid from sportsinfo where sportname = value
Show all male student ids who do n't play football .