CREATE TABLE cinema (cinema_id NUMBER, name CLOB, openning_year NUMBER, capacity NUMBER, location CLOB)
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)

Show director with the largest number of show times in total.
SELECT T2.directed_by FROM schedule AS T1 JOIN film AS T2 ON T1.film_id = T2.film_id GROUP BY T2.directed_by ORDER BY SUM(T1.show_times_per_day) DESC LIMIT 1
SELECT "T2"."directed_by" FROM "schedule" "T1" JOIN "film" "T2" ON "T1"."film_id" = "T2"."film_id" GROUP BY "T2"."directed_by" ORDER BY SUM("T1"."show_times_per_day") DESC FETCH FIRST 1 ROWS ONLY