title: How to convert date format into milliseconds in postgresql?
body: <p>I have date in postgresql in format "17/12/2011".</p>
  
  <p>How can i convert it into milliseconds using select clause of postgreql ?</p>
  
  <p>Currently i am just executing select clause as </p>
  
  <pre><code>select tableDate,tableSales 
  from table_name
  </code></pre>
  
  <p>I want to have something like when I select tableDate it should be converted into milliseconds using some postgresql functions.</p>
  
  <pre><code>tableDate DATE
  tableSales Numeric
  </code></pre>