Find the names of states that have some college students playing in the mid position but not in the goalie position.
create table tryout (cname varchar, ppos varchar, PRIMARY KEY (cname)); create table college (state varchar, cname varchar, PRIMARY KEY (state))
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'