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. REPLACE

B. All of the above

C. SUBSTRING

D. CONCAT

Answer: Option B

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

Which of the following is a valid SQL function to convert a string to uppercase?

A. UCASE()

B. Both A and C

C. TO_UPPER()

D. UPPER()

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Correct Answer: Option B

Explanation:
UPPER() is standard SQL; some DBMS also support UCASE().

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

Question #2

Which of the following ensures data integrity in RDBMS?

A. Random data entry

B. User input without checks

C. Constraints like primary key, foreign key

D. No validation rules

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Correct Answer: Option C

Explanation:
Integrity constraints such as keys enforce rules for valid data.

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

Question #3

What is a synonym in database terms?

A. A data type

B. An alias for a table or view

C. A foreign key

D. A type of index

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Correct Answer: Option B

Explanation:
A synonym is an alternative name for a database object, allowing simpler references.

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

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