Meta Meta Interview Question 02

Active
Friends
Count

Find users who have more than 3 friends.

Table Schema

Inspect
Table

interactive

Column	Type
user_id	integer
friend_id	integer

Sample Data

Sample Input: friends

Expected Output

user_id
101

SQL Editor

Waiting for query

user_id
101

Hints

Hint 01: Identify the grouping level required by the output.

Hint 02: Aggregate with COUNT, SUM, AVG, or a window function as needed.

Hint 03: Filter after aggregation with HAVING or after ranking with an outer query.

Solution

Solution is locked until you decide to reveal it. Try the editor first, then open this when you want the reference answer.

SELECT user_id
FROM friends
GROUP BY user_id
HAVING COUNT(DISTINCT friend_id) > 3;

Explanation

Read the expected output columns to determine the final grain.

Aggregate or rank the input rows to calculate the requested metric.

Filter, sort, and alias the final columns to match the output.