मैंने परीक्षण नहीं किया है, लेकिन इसे काम करना चाहिए:
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