Anonymous

SELECT u.user_id, u.username, COUNT( p.post_id ) AS count
	FROM phpbb_posts p, phpbb_users u
		WHERE p.post_time <1250373781
			AND p.post_time >1249768980
				AND u.user_id = p.poster_id
		GROUP BY p.poster_id
		ORDER BY count DESC 
			LIMIT 1