參考文檔:https://www.pythonheidong.com/blog/article/184450/
在Manager把name賦值爲None則不會被繼承!
class Employee(models.Model):
###
name = models.CharField(max_length=50, null=False)
address = models.CharField(max_length=50, null=False)
###
class Manager(Employee):
name = None