Find the names of schools that have some players in the mid position but not in the goalie position.
return schools ;return players of #1 ;return positions of #2 ;return #1 where #3 is  mid ;return #1 where #3 is  not goalie ;return names of both #4 and #5
['select', 'project', 'project', 'comparative', 'comparative', 'intersection']