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MCQ

Q.

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

A

?

B

=

C

?

D

All of the mentioned

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MCQ

1.

A query in the tuple relational calculus is expressed as:

A

{t | P() | t}

B

{P(t) | t }

C

{t | P(t)}

D

All of the mentioned

Discussion

MCQ

2.

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

Discussion

MCQ

3.

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

A

Union

B

Intersect

C

Difference

D

Projection

Discussion

MCQ

4.

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

Discussion

MCQ

5.

The number of attributes in relation is called as its

A

Cardinality

B

Degree

C

Tuples

D

Entity

Discussion

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