title: How to write Zend db select with OR condition inside AND condition
body: <p>Can someone guide me to write a query like below using Zend db select :</p>
  
  <pre><code>SELECT `tbl_md_users`.* 
  FROM `tbl_md_users` 
  WHERE 
        user_type &lt;&gt; 'TYPE1')
  AND (first_name LIKE '%tom%' OR last_name LIKE '%tom%' OR user_name LIKE '%tom%') 
  </code></pre>