CREATE TABLE climber (climber_id NUMBER, name CLOB, country CLOB, time CLOB, points NUMBER, mountain_id NUMBER)
CREATE TABLE mountain (mountain_id NUMBER, name CLOB, height NUMBER, prominence NUMBER, range CLOB, country CLOB)

Which countries have more than one mountain?
SELECT country FROM mountain GROUP BY country HAVING COUNT(*) > 1
SELECT "country" FROM "mountain" GROUP BY "country" HAVING COUNT(*) > 1