the following diagram is an example of a supertype/subtype hierarchy.

When a supertype entity inherits values of another. 61 A subtype can become a supertype if the subtype has other subtypes beneath it.

Database Modeling Chapter 1 4 Flashcards Quizlet

69 The following diagram is an example of a supertypesubtype hierarchy.

. It is best to use a supertypesubtype hierarchy when there are attributes that apply to some but not all instances of an entity type. 1 Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype. Discuss how attributes are assigned in a supertypesubtype hierarchy.

In the type hierarchy in Figure 1 sales_rep_t is a subtype of employee_t which is the supertype of sales_rep_t in the same way that person_t is the supertype of employee_tThe following. We present an example of a supertypesubtype hierarchy in this section in Figure 3-10. 70 In a supertypesubtype.

31 The following figure shows an A supertypesubtype hierarchy B completeness from MIS 101 at College of Business Administration. 3 Subtypes at the higher lever. 68 A subtype can become a supertype if the subtype has other subtypes beneath it.

Attributes are assigned at the highest logical level that is possible in the hierarchy. 2 Attributes are assigned at the lowest logical level. 62 The following diagram is.

Use of a supertypesubtype relationship is necessary when which of the following exists. For example if we have an employee entity type and. B hierarchical data model.

When a supertype entity inherits values of the subtype attribute. 35 The figure below is an example of an. When a subtype entity inherits values of the supertype attribute.

36 An entity cluster can be formed by. 61 A subtype can become a supertype if the subtype. An instance of a subtype participates in a relationship that is unique to that.

For simplicity we do not show subtype discriminators in this and most.

12 4 Mapping Supertypes And Subtypes To A Relational Database Engineering Libretexts