title: How to Check Two Conditions in $Criteria->order() in Yii
body: <p>i have my criteria like the below:</p>
  
  <pre><code>   $Criteria = new CDbCriteria();
     $Criteria-&gt;join='LEFT JOIN abc_tablename ON some_id=one_id';
     $Criteria-&gt;order = "created_date DESC,commented_date DESC";
  </code></pre>
  
  <p>the above code sorts only created_date but commented_date is not working... can any one help me in how to order with both the conditions working.</p>