How many distinct colleges are associated with players from the team with name "Columbus Crew".
create table match_season (college varchar, team varchar, PRIMARY KEY (college)); create table team (team_id varchar, name varchar, PRIMARY KEY (team_id))
select count(distinct t1.college) from match_season as t1 join team as t2 on t1.team = t2.team_id where t2.name = "columbus crew"