What is a data mart? MCQ with Answer and Explanation

Question
What is a data mart?
A. A type of database
B. A subset of a data warehouse focused on a specific business unit or function
C. A query language
D. A backup technique
Answer: Option B
Solution (By JKSSB Mock Tests)
A data mart is a specialized data warehouse for a specific department, team, or subject area.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
What does the letter 'D' stand for in the widely accepted ACID properties of database transactions?
A. Dependency
B. Data
C. Definition
D. Durability
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Correct Answer: Option D

Explanation:
ACID stands for Atomicity, Consistency, Isolation, and Durability. Durability ensures that once a transaction commits, its changes survive system failures.
This question belongs to: Computer Database Management System (DBMS)
Question #2
In SQL, which statement is used to change a user's password?
A. CHANGE USER
B. ALTER USER
C. UPDATE USER
D. MODIFY USER
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Correct Answer: Option B

Explanation:
ALTER USER is used in many DBMS to change user attributes, including password. The exact syntax varies by DBMS.
This question belongs to: Computer Database Management System (DBMS)
Question #3
Which operator is used in SQL to compare a value to a set of values returned by a subquery?
A. EXISTS
B. BETWEEN
C. LIKE
D. IN
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Correct Answer: Option D

Explanation:
IN checks if a value matches any value in a list or subquery result set.
This question belongs to: Computer Database Management System (DBMS)
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