First Commenter per Post

For each post return the name of the user who commented first. Order by post_id.

Table schema

Users(user_id INT PRIMARY KEY, name VARCHAR(20))
Comments(comment_id INT PRIMARY KEY, post_id INT, user_id INT, created_at DATETIME, flagged INT)

Sample data

Users
user_id | name
1 | Mia
2 | Noah
3 | Omar

Comments
comment_id | post_id | user_id | created_at | flagged
1 | 10 | 1 | 2026-05-01 09:00 | 0
2 | 10 | 2 | 2026-05-01 09:30 | 1
3 | 10 | 2 | 2026-05-01 10:00 | 1
4 | 11 | 3 | 2026-05-02 08:00 | 0
5 | 11 | 1 | 2026-05-02 08:10 | 0
6 | 12 | 2 | 2026-05-03 12:00 | 1
7 | 12 | 3 | 2026-05-03 11:00 | 0