Find the names of stadiums that some Australian swimmers have been to.
create table swimmer (id varchar, nationality varchar, PRIMARY KEY (id)); create table record (swimmer_id varchar, event_id varchar, PRIMARY KEY (swimmer_id)); create table stadium (name varchar, id varchar, PRIMARY KEY (name)); create table event (id varchar, stadium_id varchar, PRIMARY KEY (id))
select t4.name from swimmer as t1 join record as t2 on t1.id = t2.swimmer_id join event as t3 on t2.event_id = t3.id join stadium as t4 on t4.id = t3.stadium_id where t1.nationality = 'australia'