leetcode-problemset/leetcode-cn/problem (Chinese)/合作过至少三次的演员和导演 [actors-and-directors-who-cooperated-at-least-three-times].html

<p><code>ActorDirector</code>&nbsp;表：</p>

<pre>
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| actor_id    | int     |
| director_id | int     |
| timestamp   | int     |
+-------------+---------+
timestamp 是这张表的主键.
</pre>

<p>&nbsp;</p>

<p>写一条SQL查询语句获取合作过至少三次的演员和导演的 id 对&nbsp;<code>(actor_id, director_id)</code></p>

<p><strong>示例：</strong></p>

<pre>
ActorDirector 表：
+-------------+-------------+-------------+
| 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           |
+-------------+-------------+-------------+

Result 表：
+-------------+-------------+
| actor_id    | director_id |
+-------------+-------------+
| 1           | 1           |
+-------------+-------------+
唯一的 id 对是 (1, 1)，他们恰好合作了 3 次。</pre>