What is a database instance? MCQ with Answer and Explanation

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What is a database instance?

A. A query result

B. A backup

C. The schema definition

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

Answer: Option D

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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What is a subquery in SQL?

A. A query nested inside another query

B. A query that is always correlated

C. A query that returns multiple results

D. A query that is used to create a table

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Correct Answer: Option A

Explanation:
A subquery is a SELECT statement nested within another SQL statement (e.g., SELECT, INSERT, UPDATE, DELETE).

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

Question #2

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Which SQL command is used to permanently remove an entire table structure along with all its data from the database?

A. DELETE

B. DROP

C. TRUNCATE

D. REMOVE

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Correct Answer: Option B

Explanation:
The DROP command is a DDL statement that completely removes a table's structure, definition, and all its associated data from the database.

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

Question #3

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Which operator in SQL is used to exclude specific data records from a search based on a collection of negative criteria?

A. EXCEPT

B. MINUS

C. REMOVE

D. NOT IN

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Correct Answer: Option D

Explanation:
The NOT IN operator filters the query results to exclude records whose values match any element within the provided list or subquery.

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

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