CREATE TABLE schedule (title VARCHAR2, directed_by VARCHAR2, film_id VARCHAR2)
CREATE TABLE film (title VARCHAR2, directed_by VARCHAR2, film_id VARCHAR2)

What are the title and director of the films without any schedule?
SELECT title, directed_by FROM film WHERE NOT film_id IN (SELECT film_id FROM schedule)
SELECT "title", "directed_by" FROM "film" WHERE NOT "film_id" IN (SELECT "film_id" FROM "schedule")