ER Model and Business Rules - General Questions (2)

9.

Which one of the following symbols is not used in an ERD?

A.	Rectangle
B.	Oval
C.	Diamond
D.	Circle

Answer: Option D

Explanation:

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10.

A rectangle represents which of the following in an EER?

A.	Attribute
B.	Entity
C.	Optional One
D.	Relationship

Answer: Option B

Explanation:

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11.

A supertype/subtype hierarchy is which of the following?

A.	Each subtype has only one attribute.
B.	Each supertype has only one attribute.
C.	Each subtype has only one supertype.
D.	Each supertype has only one subtype.

Answer: Option C

Explanation:

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12.

When an entity instance must be a member of only one subtype, it is which of the following?

A.	Disjoint with total specialization
B.	Disjoint with partial specialization
C.	Overlap with total specialization
D.	Overlap with partial specialization

Answer: Option A

Explanation:

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13.

Inheritance is which of the following?

A.	When a supertype entity inherits values of the subtype attribute
B.	When a subtype entity inherits values of the supertype attribute
C.	When a supertype entity inherits values of another supertype attribute
D.	When a subtype entity inherits values of another subtype attribute

Answer: Option B

Explanation:

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14.

An oval represents which of the following in an EER?

A.	Attribute
B.	Entity
C.	Optional One
D.	Relationship

Answer: Option A

Explanation:

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15.

An action assertion must include which of the following?

A.	Anchor object
B.	Action
C.	Corresponding object
D.	All of the above.

Answer: Option D

Explanation:

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