rais.py 文件源码

def aggregate(cls, value):
        return {
            'average_age': func.avg(cls.age),
            'average_wage': func.avg(cls.wage),
            'wage': func.sum(cls.wage),
            'jobs': func.count(cls.employee),
            'average_establishment_size': func.count(cls.employee) / func.count(distinct(cls.establishment))    
        }[value]