Find the names of stadiums that the most swimmers have been to.
create table record (event_id varchar, PRIMARY KEY (event_id)); create table stadium (name varchar, id varchar, PRIMARY KEY (name)); create table event (stadium_id varchar, id varchar, PRIMARY KEY (stadium_id))
select t3.name from record as t1 join event as t2 on t1.event_id = t2.id join stadium as t3 on t3.id = t2.stadium_id group by t2.stadium_id order by count(*) desc limit 1