SELECT id, link, name, hours_together, coef
FROM (
	SELECT my_users.user_id, COUNT (*)::float / 12 AS hours_together, COUNT(*)::float / user_coef.their_hours AS coef
		FROM online{$current_user} LEFT JOIN online{$current_user} AS my_users
		ON my_users.status = online{$current_user}.status
			INNER JOIN (SELECT user_id, COUNT(*) AS their_hours
			FROM online{$current_user}
			GROUP BY user_id) AS user_coef
		ON user_coef.user_id = my_users.user_id
		WHERE online{$current_user}.user_id = {$user}
		GROUP BY online{$current_user}.user_id, my_users.user_id, user_coef.their_hours
		ORDER BY hours_together DESC
) AS my_comp
JOIN users{$current_user} ON (my_comp.user_id = id);