ER Model and Business Rules - Database MCQ Questions and answers- Technical Aptitude

11

A subtype discriminator is which of the following?

A) An attribute of the supertype whose values determine the subtype B) An attribute of the subtype whose values determine the supertype C) An attribute of the supertype whose values determine the supertype D) An attribute of the subtype whose values determine the subtype

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Answer & Solution

Answer: Option A

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12

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?

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

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Answer & Solution

Answer: Option C

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13

A subtype entity name should be which of the following?

A) A singular noun B) Specific to the organization C) Concise D) All of the above

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Answer & Solution

Answer: Option D

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14

Use of a supertype/subtype relationship is necessary when which of the following exists?

A) An instance of a subtype participates in a relationship that is unique to that subtype. B) An instance of a subtype participates in a relationship that is the same as the other subtypes. C) Attributes apply to all of the instances of an entity type. D) No attributes apply to any of the instances of an entity type.

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Answer & Solution

Answer: Option A

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15

Which of the following is not one of the three ways to classify an action assertion?

A) Condition B) Integrity Control C) Authorization D) Enabler

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Answer & Solution

Answer: Option D

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16

Packaged data models are meant to be exactly right straight out of the box.

A) True B) False

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Answer & Solution

Answer: Option B

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17

An action assertion is a statement that expresses some aspect of the static structure of the organization.

A) True B) False

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Answer & Solution

Answer: Option B

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18

A supertype can only have only one subtype.

A) True B) False

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Answer & Solution

Answer: Option B

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19

There is cardinality on an EER between the supertype and subtype.

A) True B) False

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Answer & Solution

Answer: Option B

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20

A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).

A) True B) False

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Answer & Solution

Answer: Option A

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