Corrected top dql line.

manual/codes/DQL (Doctrine Query Language) - SELECT queries - Aggregate values.php

 <?php
-// SELECT u.*, COUNT(p.id) num_posts FROM User u, u.Posts p WHERE u.id = 1
+// SELECT u.*, COUNT(p.id) num_posts FROM User u, u.Posts p WHERE u.id = 1 GROUP BY u.id
 
 $query = new Doctrine_Query();