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ER Model and Business Rules

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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ER Model and Business Rules
When an entity instance must be a member of only one subtype, it is which of the following?

Overlap with total specialization
Disjoint with total specialization
Overlap with partial specialization
Disjoint with partial specialization

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ER Model and Business Rules
Total specialization is represented by double lines between the supertype and subtype on an EER.

False
True

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ER Model and Business Rules
A subtype entity name should be which of the following?

Concise
All of these
A singular noun
Specific to the organization

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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
When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?

Disjoint with total specialization
Overlap with total specialization
Disjoint with partial specialization
Overlap with partial specialization

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