How many schools have students playing in goalie and mid-field positions?
SELECT COUNT(*) FROM (SELECT cName FROM  tryout WHERE pPos  =  'goalie' INTERSECT SELECT cName FROM  tryout WHERE pPos  =  'mid')
SELECT COUNT(*) FROM (SELECT cName FROM  tryout WHERE pPos  =  'goalie' INTERSECT SELECT cName FROM  tryout WHERE pPos  =  'mid')
[{'COUNT(*)': 1}]