/SQL/Sqlalchemy one column of two has to be not null

Sqlalchemy one column of two has to be not null

class BudgetCategories(Base):
    __tablename__ = 'budget_categories'
    # ...

    # @note: new
    __table_args__ = (
            CheckConstraint('NOT(category IS NULL AND parent_category IS NULL)'),
            )

Source: stackoverflow.com

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