Find the name of dorms which have TV Lounge but no Study Room as amenity.
select t1.dorm_name from dorm as t1 join has_amenity as t2 on t1.dormid = t2.dormid join dorm_amenity as t3 on t2.amenid = t3.amenid where t3.amenity_name = 'TV Lounge' except select t1.dorm_name from dorm as t1 join has_amenity as t2 on t1.dormid = t2.dormid join dorm_amenity as t3 on t2.amenid = t3.amenid where t3.amenity_name = 'Study Room'