CREATE TABLE swimmer (id VARCHAR(255), nationality VARCHAR(255)); CREATE TABLE record (swimmer_id VARCHAR(255), event_id VARCHAR(255)); CREATE TABLE stadium (name VARCHAR(255), id VARCHAR(255)); CREATE TABLE event (id VARCHAR(255), stadium_id VARCHAR(255))
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'