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

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"