Take a look at the `extra` method of the queryset in Django. It allows you to 
do what you are trying to do by raw SQL. 

https://docs.djangoproject.com/en/1.9/ref/models/querysets/#django.db.models.query.QuerySet.extra

Check the above link, the example with `annotate` will be interesting for you. 

I think your aim should be to create a new field and then do a `order_by` and 
`first`. 

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