Which of the following is an example of DML command? MCQ with Answer and Explanation

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Which of the following is an example of DML command?

A. DROP

B. ALTER

C. INSERT

D. CREATE

Answer: Option C

Solution (By JKSSB Mock Tests)

INSERT is a Data Manipulation Language (DML) command used to add data to tables.

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

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Practice More Database Management System (DBMS) Questions

Question #1

Which constraint ensures that a column cannot accept or store an unassigned or missing value?

A. DEFAULT

B. CHECK

C. NOT NULL

D. UNIQUE

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Correct Answer: Option C

Explanation:
The NOT NULL constraint explicitly forces a column to always contain a value, preventing blank or NULL entries.

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

Question #2

Which SQL command is used to modify the structure of an existing table?

A. ALTER

B. CHANGE

C. MODIFY

D. UPDATE

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Correct Answer: Option A

Explanation:
ALTER TABLE is a DDL command used to add, delete, or modify columns and constraints in an existing table.

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

Question #3

What is the purpose of the SQL 'NULL' value?

A. To represent zero

B. To represent missing or unknown data

C. To represent an error

D. To represent empty string

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Correct Answer: Option B

Explanation:
NULL is a special marker indicating that a value is unknown or missing, not the same as zero or empty string.

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

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