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 cinema (Cinema_ID NUMBER, Name CLOB, Openning_year NUMBER, Capacity NUMBER, Location CLOB)
CREATE TABLE schedule (Cinema_ID NUMBER, Film_ID NUMBER, Date CLOB, Show_times_per_day NUMBER, Price FLOAT)

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