title: AttributeError - 'RawQuerySet' object has no attribute 'exclude'
body: <p>I am using raw query because I wanted select unique rows based on single distinct column - Django</p>
  
  <pre><code>context['reports'] =  TimesheetEntry.objects.raw('SELECT * FROM timesheet_entry t1 INNER JOIN ( SELECT timesheet_users_id, MAX(id) AS latest_id FROM timesheet_entry GROUP BY timesheet_users_id ) t2 ON t1.timesheet_users_id = t2.timesheet_users_id AND t1.id = t2.latest_id WHERE timesheet_is_running=False')
  context['reports'] = context['reports'].exclude(pk=36)
  </code></pre>
  
  <p>It is giving me error -</p>
  
  <p><code>AttributeError - 'RawQuerySet' object has no attribute 'exclude'</code></p>
  
  <p>How can i exclude? Or How to Convert above <code>RawQuerySet</code> to <code>QuerySet</code></p>