title: how to do a join in doctrine with createQuiry or DQL
body: <p>What i want is to do is this query in doctrine : </p>
  
  <pre><code>SELECT *
  FROM `reservation`
  JOIN res_chauf ON reservation.reservation_id = res_chauf.reservation_id
  WHERE res_chauf.chauffeur_id =1
  </code></pre>
  
  <p>in doctrine/symfony2 with DQL
  i know how to do just a select like this : </p>
  
  <pre><code>$qb = $em-&gt;createQueryBuilder();
  $qb-&gt;select('c')
    -&gt;from('myBundle:Client', 'c')
    -&gt;where('c.name LIKE :data')
    -&gt;orderBy('c.name', 'ASC')
    -&gt;setParameter('data', '%'.$data.'%');
     $query = $qb-&gt;getQuery();  
     $entities = $query-&gt;getResult();
  </code></pre>
  
  <p>but now i have to join two tables</p>
  
  <p>some help please</p>
  
  <p>Thank you</p>