What is a database instance? MCQ with Answer and Explanation

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What is a database instance?

A. The schema definition

B. A backup

C. The state of a database at a particular moment in time

D. A query result

Answer: Option C

Solution (By JKSSB Mock Tests)

A database instance refers to the data stored in the database at a specific time, as opposed to the schema (structure).

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

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Question #1

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The JOIN operation in SQL is used to:

A. Delete rows

B. Combine rows from two or more tables

C. Sort data

D. Create a new database

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Correct Answer: Option B

Explanation:
JOIN combines data from multiple tables based on related columns.

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

Question #2

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What does a database constraint called a 'CHECK' constraint do?

A. It checks if the database server is running safely.

B. It verifies user authentication passwords.

C. It automatically links tables together.

D. It limits the range of values that can be placed in a column based on a specific condition.

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Correct Answer: Option D

Explanation:
A CHECK constraint enforces domain integrity by limiting the values accepted by a column to only those that satisfy a specified Boolean predicate.

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

Question #3

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Which of the following is a valid SQL data type for storing large binary data?

A. CHAR

B. VARCHAR

C. BLOB

D. TEXT

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Correct Answer: Option C

Explanation:
BLOB (Binary Large Object) is used for storing large binary data, such as images or files.

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

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