title: how to subquery in queryset in django?
body: <p>how can i have a subquery in django's queryset? for example if i have:</p>
  
  <pre><code>select name, age from person, employee where person.id = employee.id and
  employee.id in (select id from employee where employee.company = 'Private')
  </code></pre>
  
  <p>this is what i have done yet. </p>
  
  <pre><code>Person.objects.value('name', 'age')
  Employee.objects.filter(company='Private')
  </code></pre>
  
  <p>but it not working because it returns two output...</p>