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

B1 Drawing Supertypes and Subtypes on the Entity Relationship Diagram. Learn vocabulary terms and more with flashcards games and other study tools.

Database Modeling Chapter 1 4 Flashcards Quizlet

An instance of a subtype participates in a relationship that is unique to that.

. A supertypesubtype hierarchy is which of the following. 69 The following diagram is an example of a supertypesubtype hierarchy. Except for the root supertype any type in the hierarchy can be.

Use of a supertypesubtype relationship is necessary when which of the following exists. Which of the following is correct. Each supertype has only one attribute.

Start studying Data-warehouse TF Midterm questions. 35 The figure below is an example of an. 68 A subtype can become a supertype if the subtype has other subtypes beneath it.

70 In a supertypesubtype. 36 An entity cluster can be formed by. What are reasons for creating OSPF in a hierarchical design.

1To decrease routing overhead 2To speed up convergence 3To confine network instability to. Each subtype has only one supertype. For simplicity we do not show subtype discriminators in this and most.

The topmost type of any hierarchy is referred to as the root supertype. 62 The following diagram is an example of a supertypesubtype hierarchy. When a supertype entity inherits values of the subtype attribute.

63 In a supertypesubtype hierarchy attributes are assigned at the highest logical level that is. There are different ways that supertypes and subtypes can be shown on an Entity Relationship diagram ERD or. When a subtype entity inherits values of the supertype attribute.

We present an example of a supertypesubtype hierarchy in this section in Figure 3-10. Each subtype has only one attribute. 1 Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.

Hierarchy of Subtypes Each subtype can have only one immediate supertype in a hierarchy everybody has one immediate boss only except the person at the top who has none. When a supertype entity inherits values of another. 2 Attributes are assigned at the lowest logical level.

In Figure 2 person_t is the root supertype of the hierarchy. B hierarchical data model. 3 Subtypes at the higher lever.

An entity supertype is an entity type in which only common attributes are implemented described for entity subtypes that use this supertype.

Database Chp3 Test Flashcards Quizlet

Enhanced Er Database

Define Each Of The Following Terms Supertype Subtype Specialization Entity Cluster Completeness Constraint Enhanced Entity Relationship Eer Model Supertype Subtype Hierarchy Total Specialization Rule Generalization Disjoint Rule Overlap Rule Partial