GROUP_CONCAT with limit

Question

I have table with player-s in many-to-many relation with skill-s

The goal is to list the players and their \"top 3 skills\" with a single q

Answer 1

It is possible if you are using MariaDB 10.3.3+:

Support for LIMIT clause in GROUP_CONCAT() (MDEV-11297)

SELECT p.id,  
   GROUP_CONCAT(s.title ORDER BY title  SEPARATOR ', ' LIMIT 3) as skills
FROM player p
LEFT JOIN player_skills ps ON ps.player_id = p.id
LEFT JOIN skill s ON s.id = ps.skill_id
WHERE ps.value > 2
GROUP BY p.id 
ORDER BY s.id;

db<>fiddle demo