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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 10 of 11

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Q91.
The expression of generalized projection can be written as

a.

π F1, F2, Fn ( R )

b.

θ F1, F2, Fn ( R )

c.

σ F1, F2, Fn ( R )

d.

β F1, F2, Fn ( R )

Discuss
Answer: (a).π F1, F2, Fn ( R )
Q92.
The expression which specifies the procedure to retrieve rather than retrieval content is classified as

a.

procedural expression

b.

structural expression

c.

functional expression

d.

calculus expression

Discuss
Answer: (d).calculus expression
Q93.
In a query tree, the input relations of query are classified as

a.

attribute nodes

b.

leaf nodes

c.

stem nodes

d.

root nodes

Discuss
Answer: (b).leaf nodes
Q94.
With the help of selection condition, the fraction of selected tuples is classified as

a.

insertion of condition

b.

functionality of condition

c.

selectivity of the condition

d.

interactivity of condition

Discuss
Answer: (c).selectivity of the condition
Q95.
The most convenient operation which is used for the queries having universal quantification is classified as

a.

division operation

b.

multiply operation

c.

add operation

d.

subtracted operation

Discuss
Answer: (a).division operation
Q96.
Find the ID, name, dept name, salary for instructors whose salary is greater than $80,000 .

a.

{t | t ε instructor ∧ t[salary] > 80000}

b.

Э t ∈ r (Q(t))

c.

{t | Э s ε instructor (t[ID] = s[ID]∧ s[salary] > 80000)}

d.

None of the mentioned

Discuss
Answer: (a).{t | t ε instructor ∧ t[salary] > 80000}
Q97.
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

Discuss
Answer: (c).{t | P(t)}
Q98.
Which of the following best describes the query ? 
{t | Э s ε instructor (t[name] = s[name]
∧ Э u ε department (u[dept name] = s[dept name]
∧ u[building] = “Watson”))}

a.

Finds the names of all instructors whose department is in the Watson building.

b.

Finds the names of all department is in the Watson building.

c.

Finds the name of the dapartment whose instructor and building is Watson.

d.

Returns the building name of all the departments.

Discuss
Answer: (a).Finds the names of all instructors whose department is in the Watson building.
Q99.
Which of the following symbol is used in the place of except ?

a.

^

b.

V

c.

¬

d.

~

Discuss
Answer: (c).¬
Q100.
“Find all students who have taken all courses offered in the Biology department.” The expressions that matches this sentence is :

a.

Э t ε r (Q(t))

b.

∀ t ε r (Q(t))

c.

¬ t ε r (Q(t))

d.

~ t ε r (Q(t))

Discuss
Answer: (b).∀ t ε r (Q(t))
Page 10 of 11

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