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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 2 of 11

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Q11.
Which of the following is a fundamental operation in relational algebra ?

a.

Set intersection

b.

Natural join

c.

Assignment

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q12.
Which of the following is used to denote the selection operation in relational algebra ?

a.

Pi (Greek)

b.

Sigma (Greek)

c.

Lambda (Greek)

d.

Omega (Greek)

Discuss
Answer: (b).Sigma (Greek)
Q13.
For select operation the ________ appear in the subscript and the ___________ argument appears in the paranthesis after the sigma.

a.

Predicates, relation

b.

Relation, Predicates

c.

Operation, Predicates

d.

Relation, Operation

Discuss
Answer: (a).Predicates, relation
Q14.
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

Discuss
Answer: (b).Set-difference
Q15.
Which is a unary operation:

a.

Selection operation

b.

Primitive operation

c.

Projection operation

d.

Generalized selection

Discuss
Answer: (d).Generalized selection
Q16.
In precedence of set operators the expression is evaluated from

a.

Left to left

b.

Left to right

c.

Right to left

d.

From user specification

Discuss
Answer: (b).Left to right
Q17.
If E1 and E2 are relational algebra expressions, then which of the following is NOT a relational algebra expression ?

a.

E1 ∪ E2

b.

E1 / E2

c.

E1 - E2

d.

E1 x E2

Discuss
Answer: (b).E1 / E2
Q18.
The operation of a relation X, produces Y, such that Y contains only selected attributes of X. Such an operation is :

a.

Projection

b.

Intersection

c.

Union

d.

Difference

Discuss
Answer: (a).Projection
Q19.
If T1 and T2 are two relations, then which of the following is not a valid relational algebra expression ?

a.

T1 - T2

b.

T1 ∪ T2

c.

T1 ∩ T2

d.

All are valid expressions

Discuss
Answer: (d).All are valid expressions
Q20.
Which of the following is not valid unary operation in the relational algebra ?

a.

select

b.

min

c.

project

d.

rename

Discuss
Answer: (b). min
Page 2 of 11

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