OBJECT ORIENTED DATABASE QUIZ

An extent is which of the following?

Only one instance of a class within a database

A keyword that indicates that the superclass inherits from a subclass

A keyword that indicates that the subclass inherits from a superclass

The set of all instances of a class within a database

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The keyword "inverse" is used in which of the following?

Relationship

Attribute

All of these

Class

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Before specifying a key for a class, you must specify its extent.

False

True

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ODL supports the abstract keyword for classes and operations.

True

False

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Specifying a key ensures that no two objects belonging to a class have the same value for the key attribute(s).

False

True

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ODL supports which of the following types of association relationships?

Unary and Binary and Ternary

Unary

Unary and Binary and Ternary and higher

Unary and Binary

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A relationship should be specified how in the ODL?

One direction starting with the second class

Neither direction

One direction starting with the first class

Both directions

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The ODMG Object Model supports only unary and binary relationships.

True

False

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The Object Query Language is which of the following?

Similar to SQL and uses a select-where structure

Similar to SQL and uses a select-from-where structure

Similar to SQL and uses a from-where structure

Not similar to SQL

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Identify the class name for the following code: ABC123 course();

course()

ABC123

All of these

course

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