leetcode-problemset/leetcode/problem/actors-and-directors-who-cooperated-at-least-three-times.html

<p>Table: <code>ActorDirector</code></p>

<pre>
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| actor_id    | int     |
| director_id | int     |
| timestamp   | int     |
+-------------+---------+
timestamp is the primary key column for this table.
</pre>

<p>&nbsp;</p>

<p>Write a SQL query for a report that provides the pairs <code>(actor_id, director_id)</code> where the actor has cooperated with the director at least three times.</p>

<p>Return the result table in <strong>any order</strong>.</p>

<p>The query result format is in the following example.</p>

<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>

<pre>
<strong>Input:</strong> 
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           |
+-------------+-------------+-------------+
<strong>Output:</strong> 
+-------------+-------------+
| actor_id    | director_id |
+-------------+-------------+
| 1           | 1           |
+-------------+-------------+
<strong>Explanation:</strong> The only pair is (1, 1) where they cooperated exactly 3 times.
</pre>