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Q.

Which is a unary operation:

A

Selection operation

B

Primitive operation

C

Projection operation

D

Generalized selection

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MCQ

1.

The union operation is represented by

A

?

B

U

D

*

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2.

The_____ operation allows the combining of two relations by merging pairs of tuples, one from each relation, into a single tuple.

A

Select

B

Join

C

Union

D

Intersection

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3.

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

A

Name

B

Dept

C

Tot_cred

D

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4.

The _______ operator takes the results of two queries and returns only rows that appear in both result sets.

A

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B

Intersect

C

Difference

D

Projection

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5.

Which one of the following attribute can be taken as a primary key?

A

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B

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C

Id

D

Department

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