Which of the following is a valid SQL string function? MCQ with Answer and Explanation

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Which of the following is a valid SQL string function?

A. CONCAT

B. REPLACE

C. All of the above

D. SUBSTRING

Answer: Option C

Solution (By JKSSB Mock Tests)

SUBSTRING, CONCAT, and REPLACE are common string functions in SQL.

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

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Question #1

What is the purpose of the SQL DISTINCT keyword?

A. To filter rows based on a condition

B. To return only unique rows in the result set

C. To sort the result set

D. To group the results

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Correct Answer: Option B

Explanation:
DISTINCT removes duplicate rows from the query result.

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

Question #2

A view in DBMS is:

A. An index on the table

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

C. A backup of the database

D. A physical copy of the table

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Correct Answer: Option B

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

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

Question #3

What is a super key in a relational database?

A. A key that has extra attributes beyond a candidate key

B. Both A and B

C. A key that includes the primary key

D. A set of attributes that uniquely identifies a row

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Correct Answer: Option B

Explanation:
A super key is a set of one or more attributes that uniquely identifies a row. A candidate key is a minimal super key.

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

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