title: Django: How to delete duplicate rows based on 2 columns?
body: <p>I found out in <a href="https://stackoverflow.com/a/1799535/2255491">this answer</a> I can easily delete duplicate rows (duplication based on N columns) in a table with raw SQL.</p>
  
  <p>Is there an equivalence using Django ORM ?
  The only stuff I found in Django concerned duplicated based on 1 column only.</p>
  
  <p>Note : I know there is a way to prevent future duplicates (based on several fields) in Django, using <code>unique_together</code> field (but I didn't know before).</p>
  
  <p>Thanks.</p>