What are the names of players are from that college?
select t2.pname from tryout as t1 join player as t2 on t1.pid = t2.pid where t1.cname = (select cname from college order by enr desc limit 1)
Of those, who tried out for the team?
select t2.pname from tryout as t1 join player as t2 on t1.pid = t2.pid where t1.cname = (select cname from college order by enr desc limit 1)