In SQL, what does the 'IS NULL' operator check? MCQ with Answer and Explanation

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In SQL, what does the 'IS NULL' operator check?

A. Whether a value is missing (null)

B. Whether a value is empty string

C. Whether a value is zero

D. Whether a value equals NULL

Answer: Option A

Solution (By JKSSB Mock Tests)

IS NULL is used to test for NULL values, because NULL is not equal to anything.

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

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Question #1

What is 'data about data' commonly referred to in a Database Management System?

A. Hyper-data

B. Sub-data

C. Metadata

D. Directory

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Correct Answer: Option C

Explanation:
Metadata is defined as data about data. It describes the structure, constraints, data types, and properties of the actual data stored in a database.

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

Question #2

RDBMS is based on which model?

A. Relational model

B. Hierarchical model

C. Network model

D. Object-oriented model

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Correct Answer: Option A

Explanation:
Relational Database Management System (RDBMS) is based on the relational model proposed by E.F. Codd.

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

Question #3

A view in DBMS is:

A. A physical copy of the table

B. An index on the table

C. A backup of the database

D. A virtual table based on the result of a query

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Correct Answer: Option D

Explanation:
A view is a virtual table derived from one or more base tables.

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

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