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)

Count the number of different countries that climbers are from.
SELECT COUNT(DISTINCT country) FROM climber
SELECT COUNT(DISTINCT "country") FROM "climber"