directors actor 28-9-22

link -- https://www.codingninjas.com/codestudio/problems/director-s-actor_2246916?topList=top-100-sql-problems

Problem Statement

Table: ActorDirector
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| actor_id    | int     |
| director_id | int     |
| timestamp   | int     |
+-------------+---------+

Timestamp is the primary key column for this table.


Write a SQL query for a report that provides the pairs (actor_id, director_id) where the actor have co-worked with the director at least 3 times.

Example:

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           |
+-------------+-------------+-------------+

Result table:
+-------------+-------------+
| actor_id    | director_id |
+-------------+-------------+
| 1           | 1           |
+-------------+-------------+

The only pair is (1, 1) where they co-worked exactly 3 times.



------------------solution -----------------------------


select actor_id,director_id from ActorDirector 
group by 1,2
having count(1)>=3