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from django.contrib.auth.models import User
...
class Profile(User):
birthdate = models.DateField(null=False)
me = User.objects.get(pk=1)
profile = Profile.objects.create(user_ptr=me, birthdate=some_date)
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select * from table1 where (id, field1) in any(array[(pair1), (pair2), ...]), где pair1 - это как раз какая-то параAK
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