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

1 Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype. When a supertype entity inherits values of the subtype attribute.

Subtype Discriminator

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. 3 Each subtype has only one supertype. B hierarchical data model. 3 Subtypes at the higher lever.

Learn vocabulary terms and more with flashcards games and other study tools. A supertypesubtype hierarchy is which of the following. 1 Each supertype has only one attribute.

2 Attributes are assigned at the lowest logical level. Creating a Generalization Hierarchy The supertype is also assigned an attribute called a discriminator whose values. 61 A subtype can become a supertype if the subtype has other subtypes beneath it.

When a supertype entity inherits values of another. We present an example of a supertypesubtype hierarchy in this section in Figure 3-10. Use of a supertypesubtype relationship is necessary when which of the following exists.

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. 35 The figure below is an example of an. 2 Each subtype has only one attribute.

36 An entity cluster can be formed by. How attributes are assigned in a supertype subtype hierarchy. For simplicity we do not show subtype discriminators in this and most.

62 The following diagram. An entity supertype is an entity type in which only common attributes are implemented described for entity subtypes that use this supertype. An instance of a subtype participates in a relationship that is unique to that.

61 A subtype can become a supertype if the subtype. When a subtype entity inherits values of the supertype attribute.

Enhanced Entity Relationship Model