title: What is the name of default DUAL table in Netezza
body: <p>I need to query Netezza Data Warehouse. I've been told not to use any table for the moment. I had checked for the existence of <code>DUAL</code> table and found over the net like,- there is a <code>_v_dual</code> table as like Oracle <code>DUAL</code>.</p>
  
  <p>Is the information is correct that I can query with <code>_v_dual</code>. Is this available by default for all Netezza database or is it something else I have to do in order bring up the <code>DUAL</code> functionality for Netezza Data Warehouse Querying.</p>