CREATE TABLE film_actor (actor_id VARCHAR)
CREATE TABLE actor (first_name VARCHAR, last_name VARCHAR, actor_id VARCHAR)

Which film actor (actress) starred the most films? List his or her first name, last name and actor id.
SELECT T2.first_name, T2.last_name, T2.actor_id FROM film_actor AS T1 JOIN actor AS T2 ON T1.actor_id = T2.actor_id GROUP BY T2.actor_id ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T2"."first_name", "T2"."last_name", "T2"."actor_id" FROM "film_actor" AS "T1" JOIN "actor" AS "T2" ON "T1"."actor_id" = "T2"."actor_id" GROUP BY "T2"."actor_id" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1