CREATE TABLE stadium (country VARCHAR2, capacity NUMBER)

Which country has both stadiums with capacity greater than 60000 and stadiums with capacity less than 50000?
SELECT country FROM stadium WHERE capacity > 60000 INTERSECT SELECT country FROM stadium WHERE capacity < 50000
SELECT "country" FROM "stadium" WHERE "capacity" > 60000 INTERSECT SELECT "country" FROM "stadium" WHERE "capacity" < 50000