CODE EXAMPLE FOR PYTHON

django q and f

from django.db.models import Aggregate

class Sum(Aggregate):
    # Supports SUM(ALL field).
    function = 'SUM'
    template = '%(function)s(%(all_values)s%(expressions)s)'
    allow_distinct = False

    def __init__(self, expression, all_values=False, **extra):
        super().__init__(
            expression,
            all_values='ALL ' if all_values else '',
            **extra
        )