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Exam 2: Data Models

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Question 41

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The data model uses the concept of inheritance.

A) relational
B) network
C) object-oriented
D) entity relationship

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Question 42

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A(n) enables a database administrator to describe schema components.

A) extensible markup language (XML)
B) data definition language (DDL)
C) unified modeling language (UML)
D) query language

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Question 43

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A(n) 's main function is to help one understand the complexities of the real­world environment.

In an SQL-based relational database,each table is dependent on every other table.

Today,most relational database products can be classified as object/relational.

In Chen notation,entities and relationships have to be oriented horizontally; not vertically.

In ,a three­pronged symbol represents the "many" side of the relationship.

Even when a good database blueprint is available,an applications programmer's view of the data should match that of the manager and the end user.

M:N relationships are not appropriate in a relational model.

A(n)is a brief,precise,and unambiguous description of a policy,procedure,or principle within a specific organization.

In the model,each parent can have many children,but each child has only one parent.

An implementation-ready data model should contain a description of the data structure that will store the end-user data.

A(n) represents a particular type of object in the real world.

What are the sources of business rules,and what is the database designer's role with regard to business rules?

In the model,the user perceives the database as a collection of records in 1:M relationships,where each record can have more than one parent.