SELECT COUNT(*) FROM (SELECT T1.state FROM college AS T1 JOIN tryout AS T2 ON T1.cName  =  T2.cName WHERE T2.pPos  =  'mid' EXCEPT SELECT T1.state FROM college AS T1 JOIN tryout AS T2 ON T1.cName  =  T2.cName WHERE T2.pPos  =  'goalie')
What is the count of states with college students playing in the mid position but not as goalies?
SELECT COUNT ( * ) FROM ( SELECT T1.state FROM college AS T1 JOIN tryout AS T2 ON T1.cName = T2.cName WHERE T2.pPos = 'mid ' EXCEPT SELECT T1.state FROM college AS T1 JOIN tryout AS T2 ON T1.cName = T2.cName WHERE T2.pPos = 'goalie ' )
select count ( * ) from ( select t1 . state from college as t1 join tryout as t2 on t1 . cname = t2 . cname where t2 . ppos = value except select t1 . state from college as t1 join tryout as t2 on t1 . cname = t2 . cname where t2 . ppos = value )
What is the count of states with college students playing in the mid position but not as goalies ?