CREATE TABLE region (region_id DECIMAL, region_code TEXT, region_name TEXT)
CREATE TABLE storm (storm_id DECIMAL, name TEXT, dates_active TEXT, max_speed DECIMAL, damage_millions_usd DECIMAL, number_deaths DECIMAL)
CREATE TABLE affected_region (region_id DECIMAL, storm_id DECIMAL, number_city_affected DECIMAL)

What are the names of regions that were not affected?
SELECT region_name FROM region WHERE NOT region_id IN (SELECT region_id FROM affected_region)
SELECT "region_name" FROM "region" WHERE NOT "region_id" IN (SELECT "region_id" FROM "affected_region")