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MCQ

Q.

Consider attributes ID, CITY and NAME. Which one of this can be considered as a super key?

A

NAME

B

ID

C

CITY

D

CITY, ID

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MCQ

1.

The ___________ operation, denoted by -, allows us to find tuples that are in one relation but are not in another.

A

Union

B

Set difference

C

Difference

D

Intersection

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2.

The relational model feature is that there

A

is no need for primary key data.

B

is much more data independence than some other database models.

C

are explicit relationships among records.

D

are tables with many dimensions.

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3.

Which is a unary operation:

A

Selection operation

B

Primitive operation

C

Projection operation

D

Generalized selection

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4.

A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.

A

Rows

B

Key

C

Attribute

D

Fields

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5.

Which one of the following cannot be taken as a primary key?

A

Id

B

Register number

C

Dept_id

D

Street

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