SELECT * FROM k4_users WHERE user_id=9 GROUP BY user_id LIMIT 1

SELECT wp.*, u.name AS poster_name FROM k4_wall_posts wp LEFT JOIN k4_users u ON wp.poster_id=u.user_id WHERE wp.user_id=9 AND (wp.private < 1 OR wp.private=1 AND wp.poster_id=1) GROUP BY wp.post_id ORDER BY created DESC LIMIT 10