Show director with the largest number of show times in total.
create table schedule (film_id varchar, show_times_per_day integer, PRIMARY KEY (film_id)); create table film (directed_by varchar, film_id varchar, PRIMARY KEY (directed_by))
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