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MCQ

Q.

Which of the following operation is used if we are interested in only certain columns of a table?

A

PROJECTION

B

SELECTION

C

UNION

D

JOIN

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1.

Student(ID, name, dept name, tot_cred) In this query which attributes form the primary key?

A

Name

B

Dept

C

Tot_cred

D

ID

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2.

The intersection operator is used to get the _____ tuples.

A

Different

B

Common

C

All

D

Repeating

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3.

Which of the following is the comparison operator in tuple relational calculus

A

?

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=

C

?

D

All of the mentioned

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4.

The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as a primary key is called

A

Referential relation

B

Referencing relation

C

Referenced relation

D

Referred relation

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5.

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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