ORM PostgreSQL stuff

Hello

Is it possible to do in ORM or in PostgreSQL

Assume we have a table with date and price

# class Item(models.Model):
#    price = models.DecimalField()
#    date = models.DateField()

We need for every item in table find division of two prices by two dates and then order_by that result of division


P.S. i can accomplish this via signals but... i don't want to create no more denormalized tables

Tnx in advance :)

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