What is a domain in the context of the relational model? MCQ with Answer and Explanation

Question

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

A. A primary key

B. A foreign key

C. A table name

D. A set of allowed values for an attribute

Answer: Option D

Solution (By JKSSB Mock Tests)

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)

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Question #1

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An attribute whose value is computed dynamically from another attribute (such as calculating Age from Date_of_Birth) is called a what?

A. Multi-valued Attribute

B. Stored Attribute

C. Derived Attribute

D. Base Attribute

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Correct Answer: Option C

Explanation:
A Derived Attribute is an attribute whose values are not stored physically in the database but are calculated at runtime from other stored attributes.

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

Question #2

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What type of entity cannot be uniquely identified by its own attributes alone and must rely on a relationship with a parent entity?

A. Associative Entity

B. Weak Entity

C. Abstract Entity

D. Strong Entity

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Correct Answer: Option B

Explanation:
A Weak Entity is an entity that does not possess its own primary key and depends on an identifying relationship with a strong (owner) entity.

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