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Data modeling with er model Practice Questions & Answers

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A subtype entity is a special case of another entity called a supertype entity.

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A subtype entity is a special case of another entity called a supertype entity.

A).  True

B).  False

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When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.

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When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.

A).  True

B).  False

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Composite identifiers consist of two or more attributes.

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Composite identifiers consist of two or more attributes.

A).  True

B).  False

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Entities use identifiers while tables use keys.

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Entities use identifiers while tables use keys.

A).  True

B).  False

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The degree of a relationship refers to the number of entity classes in the relationship.

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The degree of a relationship refers to the number of entity classes in the relationship.

A).  True

B).  False