create table film like sakila.film;
insert into film select * from sakila.film;;
UPDATE film
SET rental_rate =
CASE rating
WHEN 'G' THEN rental_rate * 0.95
WHEN 'R' THEN rental_rate * 1.20
WHEN 'NC-17' THEN rental_rate * 1.20
ELSE rental_rate * 1.05
END;
;
select film_id, rental_rate from film;