[SQL] pobierz, plaintext 
SELECT user_id, COUNT( * ) number_of_comments FROM comment GROUP BY user_id ORDER BY number_of_comments DESC LIMIT 1
[SQL] pobierz, plaintext 

[SQL] pobierz, plaintext 
SELECT count( id_user) AS liczebnosc, id_user
FROM comment GROUP BY id_user
ORDER BY liczebnosc DESC LIMIT 1
[SQL] pobierz, plaintext