title: how can use create command query maker
body: <p>I have a query like this</p>
  
  <pre><code>Yii::app()-&gt;db-&gt;createCommand("SELECT * FROM `tbl_one` t1 LEFT JOIN `tbl_two` t2 on       t1.idea_id = t2.id WHERE create_time &gt;=:t")-&gt;bindValues(array(":t" =&gt;$start))-&gt;queryScalar();
  </code></pre>
  
  <p>in yii farme work but dosent work!!
  please help me</p>