What is a relation in relational database terms? MCQ with Answer and Explanation

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What is a relation in relational database terms?

A. A column

B. A key

C. A row

D. A table

Answer: Option D

Solution (By JKSSB Mock Tests)

In the relational model, a relation is a table consisting of rows and columns.

This question belongs to: Computer Database Management System (DBMS)

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Practice More Database Management System (DBMS) Questions

Question #1

In SQL, how do you check if a value is NOT NULL?

A. IS NOT NULL

B. != NULL

C. IS NULL

D. NOT NULL

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Correct Answer: Option A

Explanation:
IS NOT NULL is the correct operator to test for non-NULL values.

This question belongs to: Computer Database Management System (DBMS)

Question #2

What is a domain in the context of the relational model?

A. A table name

B. A set of allowed values for an attribute

C. A foreign key

D. A primary key

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Correct Answer: Option B

Explanation:
A domain defines the set of permissible values that an attribute can take, ensuring data consistency.

This question belongs to: Computer Database Management System (DBMS)

Question #3

Which type of integrity constraint ensures that a foreign key value must either match an existing primary key value in the parent table or be NULL?

A. Entity Integrity

B. Key Integrity

C. Domain Integrity

D. Referential Integrity

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Correct Answer: Option D

Explanation:
Referential Integrity ensures that relationships between tables remain consistent, requiring a foreign key to point to a valid existing row in the referenced table.

This question belongs to: Computer Database Management System (DBMS)

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