CREATE TABLE body_builder (body_builder_id NUMBER, people_id NUMBER, snatch NUMBER, clean_jerk NUMBER, total NUMBER)
CREATE TABLE people (people_id NUMBER, name CLOB, height NUMBER, weight NUMBER, birth_date CLOB, birth_place CLOB)

How many distinct birth places are there?
SELECT COUNT(DISTINCT birth_place) FROM people
SELECT COUNT(DISTINCT "birth_place") FROM "people"