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MCQ

Q.

Data integrity constraints are used to:

A

Control who is allowed access to the data

B

Ensure that duplicate records are not entered into the table

C

Improve the quality of data entered for a specific property

D

Prevent users from changing the values stored in the table

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MCQ

1.

The refinement from an initial entity set into successive levels of entity subgroupings represents a ________ design process in which distinctions are made explicit.

A

Hierarchy

B

Bottom-up

C

Top-down

D

Radical

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MCQ

2.

The entity relationship set is represented in E-R diagram as

A

Double diamonds

B

Undivided rectangles

C

Dashed lines

D

Diamond

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3.

Let us consider phone_number ,which can take single or several values . Treating phone_numberas an _________ permits instructors to have several phone numbers (including zero) associated with them.

A

Entity

B

Attribute

C

Relation

D

Value

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4.

In E-R diagram generalization is represented by

A

Ellipse

B

Dashed ellipse

C

Rectangle

D

Triangle

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5.

_____________ express the number of entities to which another entity can be associated via a relationship set.

A

Mapping Cardinality

B

Relational Cardinality

C

Participation Constraints

D

None of the mentioned

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