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

How many persons are not body builders?
SELECT COUNT(*) FROM people WHERE NOT people_id IN (SELECT people_id FROM body_builder)
SELECT COUNT(*) FROM "people" WHERE NOT "people_id" IN (SELECT "people_id" FROM "body_builder")