CREATE TABLE musical (musical_id DECIMAL, name TEXT, year DECIMAL, award TEXT, category TEXT, nominee TEXT, result TEXT)
CREATE TABLE actor (actor_id DECIMAL, name TEXT, musical_id DECIMAL, character TEXT, duration TEXT, age DECIMAL)

What are the names of actors who are not 20 years old?
SELECT name FROM actor WHERE age <> 20
SELECT "name" FROM "actor" WHERE "age" <> 20