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Exam 2: Data Models

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Question 41

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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 42

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

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Question 43

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

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

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.

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

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

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

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.

The data model uses the concept of inheritance.

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

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.

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

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