UPDATE SINGLE ROW IN SQL 
UPDATE Person
SET age = 20
WHERE id = 1;

UPDATE SINGLE ROW IN DJANGO

person = Person.objects.get(id=1)

person.age = 20
person.save()
UPDATE MULTIPLE ROWS IN SQL 
UPDATE Person
SET age = age * 1.5;

UPDATE MULTIPLE ROWS IN DJANGO

from django.db.models import F

Person.objects.update(age=F('age')*1.5)
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