What are the names of the tracks for each race?
select t2.name,t1.name from race as t1 join track as t2 on t1.track_id = t2.track_id
For each track, what is the number of races?
select t2.name,t1.name, count(*) from race as t1 join track as t2 on t1.track_id = t2.track_id group by t1.track_id
Which track name has the most number of races?
select t2.name from race as t1 join track as t2 on t1.track_id = t2.track_id group by t1.track_id order by count(*) desc limit 1