请帮助我如何在MsAccess数据库中创建复合资源成本表。例如：
Composite Excavator Cost =
Excavator basic cost + Operator composite cost+ fuel cost
While
Operator composite cost= operator basic cost+ accommodation cost+ food allowance
等等。一些资源组合需要多级基础和复合资源。 谢谢 姆