Which of the following is NOT an aggregate function in standard SQL? MCQ with Answer and Explanation

Question
Which of the following is NOT an aggregate function in standard SQL?
A. LENGTH()
B. COUNT()
C. AVG()
D. SUM()
Answer: Option A
Solution (By JKSSB Mock Tests)
SUM(), AVG(), and COUNT() are aggregate functions operating on multiple rows, whereas LENGTH() is a scalar function acting on a single text value.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
What is a database transaction?
A. A query that reads data
B. A backup copy of the database
C. A database schema
D. A logical unit of work that consists of one or more SQL statements
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Correct Answer: Option D

Explanation:
A transaction is a sequence of operations performed as a single logical unit, ensuring ACID properties.
This question belongs to: Computer Database Management System (DBMS)
Question #2
What is the main advantage of using a DBMS over a file system?
A. Data security and access control are provided
B. All of the above
C. Data redundancy is minimized
D. Data consistency is maintained
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Correct Answer: Option B

Explanation:
A DBMS offers advantages like reduced redundancy, consistency, security, concurrent access, and backup/recovery compared to file systems.
This question belongs to: Computer Database Management System (DBMS)
Question #3
Which model represents data in the form of tables?
A. Relational model
B. Entity-Relationship model only
C. Hierarchical model
D. Network model
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Correct Answer: Option A

Explanation:
The relational model uses tables (relations) to represent data and relationships.
This question belongs to: Computer Database Management System (DBMS)
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