Table schema:
CREATE TABLE swimmer (id VARCHAR, nationality VARCHAR); CREATE TABLE record (swimmer_id VARCHAR, event_id VARCHAR); CREATE TABLE stadium (name VARCHAR, id VARCHAR); CREATE TABLE event (id VARCHAR, stadium_id VARCHAR)

Question: Find the names of stadiums that some Australian swimmers have been to.
SQL: 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'