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ER Model and Business Rules

ER Model and Business Rules
An action assertion must include which of the following?

Anchor object
Action
Corresponding object
All of these

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ER Model and Business Rules
If an entity adheres to the disjoint rule, then an entity instance can be a member of more than one entity for a given supertype.

True
False

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ER Model and Business Rules
A supertype can only have only one subtype.

True
False

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ER Model and Business Rules
A supertype/subtype hierarchy is which of the following?

Each supertype has only one attribute.
Each subtype has only one supertype.
Each supertype has only one subtype.
Each subtype has only one attribute.

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ER Model and Business Rules
An oval represents which of the following in an EER?

Attribute
Relationship
Entity
Optional One

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ER Model and Business Rules
It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.

True
False

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