Regrouper par mois et renvoyer 0 si données introuvables

Je n'ai pas testé mais ça devrait marcher :

SELECT MONTH(created_at) AS month_num, 
DATE_FORMAT(created_at, '%b') AS month_name, ifnull(count(*),0) AS total_num 
    FROM table WHERE user_id=1384249399168
    GROUP BY MONTH(created_at) ORDER BY created_at DESC