[SQL 문제 풀이] Actors and Directors Who Cooperated At Least Three Times (세 번 이상 협력한 배우와 감독)

Can you solve this real interview question? Actors and Directors Who Cooperated At Least Three Times - Table: ActorDirector +-------------+---------+ | Column Name | Type | +-------------+---------+ | actor_id | int | | director_id | int | | timestamp | int | +-------------+---------+ timestamp is the primary key (column with unique values) for this table.   Write a solution to find all the pairs (actor_id, director_id) where the actor has cooperated with the director at least three times. Return the result table in any order. The result format is in the following example.   Example 1: Input: ActorDirector table: +-------------+-------------+-------------+ | actor_id | director_id | timestamp | +-------------+-------------+-------------+ | 1 | 1 | 0 | | 1 | 1 | 1 | | 1 | 1 | 2 | | 1 | 2 | 3 | | 1 | 2 | 4 | | 2 | 1 | 5 | | 2 | 1 | 6 | +-------------+-------------+-------------+ Output: +-------------+-------------+ | actor_id | director_id | +-------------+-------------+ | 1 | 1 | +-------------+-------------+ Explanation: The only pair is (1, 1) where they cooperated exactly 3 times.