title: Filter out only latest entries, for Orders
body: <p>I'm trying to write a query where i select the latest changes on a specific Order in an OrderTable
  ex.</p>
  
  <pre><code>OrderID|       ChangeDate      | 
  -------|-----------------------|
  Order1 |2013-03-17 14:40:47.000|
  Order2 |2013-03-12 12:34:09.000|
  Order3 |2013-03-20 18:30:12.000|
  Order1 |2013-03-20 16:09:09.000|
  Order2 |2013-03-20 12:39:49.000|
  </code></pre>
  
  <p>Say (from the Example above), what i need is the latest entries of Order1,Order2 and Order3.
  Has anyone been in a similar situation?
  I am really greatefull for your help!</p>