CREATE TABLE film (film_id NUMBER, title CLOB, studio CLOB, director CLOB, gross_in_dollar NUMBER)
CREATE TABLE market (market_id NUMBER, country CLOB, number_cities NUMBER)
CREATE TABLE film_market_estimation (estimation_id NUMBER, low_estimate NUMBER, high_estimate NUMBER, film_id NUMBER, type CLOB, market_id NUMBER, year NUMBER)

List the name of film studio that have the most number of films.
SELECT studio FROM film GROUP BY studio ORDER BY COUNT(*) DESC LIMIT 1
SELECT "studio" FROM "film" GROUP BY "studio" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY