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Welcome to the Relational Algebra MCQs Page

Dive deep into the fascinating world of Relational Algebra with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Relational Algebra, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of Relational Algebra, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within DBMS.

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Check out the MCQs below to embark on an enriching journey through Relational Algebra. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of DBMS.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Relational Algebra. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Relational Algebra MCQs | Page 6 of 11

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Q51.
The JOIN operation which uses any of the comparison operators is classified as

a.

THETA JOIN

b.

CHI-JOIN

c.

PI-JOIN

d.

SIGMA-JOIN

Discuss
Answer: (a).THETA JOIN
Q52.
The kind of operation by which one tuple can be created with the help of combining tuples from two relations is classified as

a.

square operation

b.

join operation

c.

division operation

d.

relation operation

Discuss
Answer: (b).join operation
Q53.
Consider two tuples X and Y, the operation whose result includes tuples that are only in X but not in Y is classified as

a.

square of relation X and Y

b.

union of relation X and Y

c.

intersection of relation X and Y

d.

difference of relation X and Y

Discuss
Answer: (d).difference of relation X and Y
Q54.
As compared to Cartesian product, the tuples which appears in the result by applying JOIN are the ones

a.

that fulfills the condition

b.

that does not fulfill the condition

c.

that are nested

d.

that are subtracted

Discuss
Answer: (a).that fulfills the condition
Q55.
Consider two tuples R and S, the maximum size of R and S relations is divided to expected size of join is classified as

a.

equi join selectivity

b.

natural selectivity

c.

join selectivity

d.

theta selectivity

Discuss
Answer: (c).join selectivity
Q56.
In the notation for query trees, the node which is used to terminate the execution is classified as

a.

attribute nodes

b.

leaf nodes

c.

stem nodes

d.

root nodes

Discuss
Answer: (d).root nodes
Q57.
The expression used in relational calculus to specify request of retrieval is classified as

a.

declarative expression

b.

procedural expression

c.

structural expression

d.

functional expression

Discuss
Answer: (a).declarative expression
Q58.
The compatibility condition which states that the relations for union and intersection operations must consist of same type of tuples is classified as

a.

union compatibility

b.

intersect compatibility

c.

row compatibility

d.

column compatibility

Discuss
Answer: (a).union compatibility
Q59.
If the common attributes of two relations are classified as join attributes then the OUTER UNION must be equal to

a.

LEFT OUTER JOIN

b.

FULL OUTER JOIN

c.

HALF OUTER JOIN

d.

DOWNWARD JOIN

Discuss
Answer: (b).FULL OUTER JOIN
Q60.
The degree of the PROJECT operation is equal to

a.

number of entities

b.

number of attributes

c.

number of columns

d.

number of rows

Discuss
Answer: (b).number of attributes
Page 6 of 11

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