title: Remove duplicates in a Django query
body: <p>Is there a simple way to remove duplicates in the following basic query:</p>
  <pre><code>email_list = Emails.objects.order_by('email')
  </code></pre>
  <p>I tried using <code>duplicate()</code> but it was not working. What is the exact syntax for doing this query without duplicates?</p>