property subtype entities possess values attributes supertype

What is the property by which subtype entities possess the values of all attributes of a supertype?

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Terms in this set (7)

c. attribute inheritance

1.
The property by which subtype entities possess the values of all attributes of a supertype is called:

a. hierarchy reception

b. class management

c. attribute inheritance

d. generalization

a. there are attributes that apply to some but not all instances of an entity type

2.
Subtypes should be used when:

a. there are attributes that apply to some but not all instances of an entity type

b. supertypes related to objects outside the business

c. the instance of a subtype do not participate in a relationship that is unique to that subtype

d. a recursive relationship is needed

a. specialization

3.
The process of defining one or more subtypes of a supertype and forming relationships is called:

a. specialization

b. generalization

c. creating discord

d. selecting classes

c. total specialization

4.
The following figure is an example of:

a. partial specialization

b. completeness

c. total specialization

d. disjointness

c. partial specialization

5.
The ____ rule specifies that an entity instance of a supertype is allowed not to belong to any subtype.

a. semi-specialization

b. total specialization

c. partial specialization

d. disjointedness

e. zero

a. logical specifications

6.
A form of database specification which maps conceptual requirements is called:

a. logical specifications

b. response specifications

c. security specifications

d. physical specifications

c. foreign key

7.
An attribute in a relation of a database that serves as the primary key of another relation in the same database is called a:

a. link attribute

b. link key

c. foreign key

d. foreign attribute

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What is supertype and subtype entities?

A supertype is a generic entity type that has a relationship with one or more subtypes. A subtype is a sub-grouping of the entities in an entity type that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroups.

Is the process of defining one or more subtypes from a given supertype?

Generalization: The process of defining a more general entity type from a set of more specialized entity types. BOTTOM-UP..
Specialization: The process of defining one or more subtypes of the supertype and forming supertype/subtype relationships. TOP-DOWN..

What rule specifies that an entity can be a member of only one subtype at a time?

Disjoint rule. Specifies that if an entity instance (of the supertype) is a member of one subtype, it cannot simultaneously be a member of two (or more) subtypes. Overlap rule. Specifies that an entity instance can simultaneously be a member of two (or more) subtypes.

What is an entity subtype?

An entity subtype is a collection of entities of the same entity type to which a narrower definition and additional predicates apply. That is to say, entity types can be sub-typed, if there are entities of that type which have unique definitions, attributes, or relationships.

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