CREATE TABLE film (film_id NUMBER, rank_in_series NUMBER, number_in_season NUMBER, title CLOB, directed_by CLOB, original_air_date CLOB, production_code CLOB)
CREATE TABLE schedule (cinema_id NUMBER, film_id NUMBER, date CLOB, show_times_per_day NUMBER, price NUMBER)
CREATE TABLE cinema (cinema_id NUMBER, name CLOB, openning_year NUMBER, capacity NUMBER, location CLOB)

List all directors along with the number of films directed by each director.
SELECT directed_by, COUNT(*) FROM film GROUP BY directed_by
SELECT "directed_by", COUNT(*) FROM "film" GROUP BY "directed_by"