title: Django SUM Query?
body: <p>I have a query akin to the following:</p>
  <pre class="lang-sql prettyprint-override"><code>SELECT SUM(ISNULL(table.name)) FROM table
  </code></pre>
  <p>How does that <code>SUM</code> translate into a <code>QuerySet</code> in Django? i.e. What operation <code>xyz</code> does it translate to, in something like <code>MyModel.objects.xyz()</code>?</p>