Which film actors (actresses) played a role in more than 30 films? List his or her first name and last name.
create table film_actor (actor_id varchar, PRIMARY KEY (actor_id)); create table actor (first_name varchar, last_name varchar, actor_id varchar, PRIMARY KEY (first_name))
select t2.first_name, t2.last_name from film_actor as t1 join actor as t2 on t1.actor_id = t2.actor_id group by t2.actor_id having count(*) > 30