CREATE TABLE event (id NUMBER, name CLOB, stadium_id NUMBER, year CLOB)
CREATE TABLE swimmer (id NUMBER, name CLOB, nationality CLOB, meter_100 NUMBER, meter_200 CLOB, meter_300 CLOB, meter_400 CLOB, meter_500 CLOB, meter_600 CLOB, meter_700 CLOB, time CLOB)
CREATE TABLE stadium (id NUMBER, name CLOB, capacity NUMBER, city CLOB, country CLOB, opening_year NUMBER)
CREATE TABLE record (id NUMBER, result CLOB, swimmer_id NUMBER, event_id NUMBER)

Find the names of stadiums that the most swimmers have been to.
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
SELECT "t3"."name" FROM "record" "t1" JOIN "event" "t2" ON "t1"."event_id" = "t2"."id" JOIN "stadium" "t3" ON "t2"."stadium_id" = "t3"."id" GROUP BY "t2"."stadium_id" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY