44、 member purchased.- A member can have a purchase.- Each purchase is for one commodity.RegistrationThe registration of a member for a class.- Registration is issued by a member.- Each registration is for one class.2. Relationship TypesEntity nameMultiplicityEntityMultiplicityEntity NameStaff1.1Manage 。

45、s0.1DepartmentStaff1.1Belongs to1.1DepartmentStaff 1.1Has 1.*SalaryTrainer1.1Is a1.1StaffInstructor1.1Is a 1.1StaffStaff1.1Receives0.*MemberMember1.1Has 1.*CardMember1.1Has1.*PhysicalTestTrainer 1.1Trains1.*MemberClass1.1Takes 1.1RoomInstructor 1.1Teaches1.*ClassSupplier1.1Provides1.*EquipmentSupplier1.1Provides1.*CommodityStaff 1.1Contacts 0.*SupplierMember1.1Makes0.*RegistrationRegistration1.1Registers1.1ClassMember1.1Issues0.*PurchasePurchase1.1Contains1.1Commodity 。

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标题：数据库|数据库的设计、实现和管理健身房数据库系统( 四 )