NULL IN SQL 
SELECT *
FROM Person
WHERE age is NULL;

AND IN DJANGO

Person.objects.filter(age__isnull=True)

# Alternate approach
Person.objects.filter(age=None)
NOT NULL IN SQL 
SELECT *
FROM Person
WHERE age is NOT NULL;

NOT NULL IN DJANGO

Person.objects.filter(age__isnull=False)

# Alternate approach
Person.objects.exclude(age=None)
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