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Exam 2: Data Models

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Question 31

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Which of the following is true of business rules?

A) They allow the designer to set company policies with regard to data.
B) They allow the designer to develop business processes.
C) They can serve as a communication tool between the users and designers.
D) They provide a framework for the company's self actualization.

E) A) and B)
F) A) and C)

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Question 32

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

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The main sources of business rules are c...

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Question 33

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In an SQL-based relational database,rows in different tables are related based on common values in common attributes.

The terms data model and database model are often used interchangeably.

In object-oriented terms,a(n)____________________ defines an object's behavior.

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

In Chen notation,entities and relationships must be oriented horizontally.

A(n) ____ is bidirectional.

The ____ model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.

A(n)____________________ is a collection of similar objects with a shared structure and behavior.

A(n) ____ is anything about which data are to be collected and stored.

Business rules apply to businesses and government groups,but not to other types of organizations such as religious groups or research laboratories.

The relational data model was developed in the ____.

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

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

Describe a conceptual model and its advantages.What is the most widely used conceptual model?

The ____________________ is the conceptual organization of the entire database as viewed by the database administrator.

In ____________________,relationships are represented by a diamond connected to the related entities through a relationship line.

Students and classes have a ____ relationship.

What components should an implementation-ready data model contain?