What type of key uniquely identifies each record in a table and cannot contain NULL values? MCQ with Answer and Explanation

Question
What type of key uniquely identifies each record in a table and cannot contain NULL values?
A. Primary Key
B. Secondary Key
C. Candidate Key
D. Foreign Key
Answer: Option A
Solution (By JKSSB Mock Tests)
A Primary Key is a unique identifier for each tuple in a relation. It enforces entity integrity and strictly cannot accept NULL values.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
Which normal form eliminates all transitive dependencies?
A. 2NF
B. BCNF
C. 3NF
D. 1NF
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Correct Answer: Option C

Explanation:
Third Normal Form (3NF) eliminates transitive dependencies, where non-key attributes depend on other non-key attributes.
This question belongs to: Computer Database Management System (DBMS)
Question #2
Which SQL statement is used to delete an existing view from the database catalog?
A. CLEAR VIEW
B. DROP VIEW
C. REMOVE VIEW
D. DELETE VIEW
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Correct Answer: Option B

Explanation:
Because a View is a database structural object, it is removed from the database schema using the DDL command 'DROP VIEW'.
This question belongs to: Computer Database Management System (DBMS)
Question #3
What is the full form of RDBMS?
A. Real-time Database Management Software
B. Random Data Backup Management System
C. Relational Data Binary Management System
D. Relational Database Management System
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Correct Answer: Option D

Explanation:
RDBMS stands for Relational Database Management System.
This question belongs to: Computer Database Management System (DBMS)
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