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1729. Find Followers Count

SQL 50 · Sorting and Grouping (day 4). Decode it with the hints, solve it on LeetCode, then compare with the reference solution in MySQLPostgreSQL.

Your work

Status Notes Your solution (MySQLPostgreSQL)

Open one at a time. Try to finish with as few as you can.

1. What does one output row represent?

One user.

2. Approach

GROUP BY user_id, COUNT(follower_id), ORDER BY user_id.

3. The trap

Straight GROUP BY; nothing hidden.

Tested on MySQL 8.0 and PostgreSQL 16. Switch dialect at the top of the page.

Show the MySQLPostgreSQL solution

SELECT user_id, COUNT(follower_id) AS followers_count
FROM Followers
GROUP BY user_id
ORDER BY user_id;