DCL commands in SQL include: MCQ with Answer and Explanation

Question
DCL commands in SQL include:
A. SELECT and JOIN
B. INSERT and UPDATE
C. CREATE and DROP
D. GRANT and REVOKE
Answer: Option D
Solution (By JKSSB Mock Tests)
Data Control Language (DCL) commands manage access permissions.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
Which of the following is a TCL (Transaction Control Language) command?
A. CREATE
B. DROP
C. SAVEPOINT
D. SELECT
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Correct Answer: Option C

Explanation:
Transaction Control Language includes COMMIT, ROLLBACK, and SAVEPOINT.
This question belongs to: Computer Database Management System (DBMS)
Question #2
The concept that prevents concurrent transactions from interfering with each other and creating data inconsistencies is known as what?
A. Isolation
B. Consistency
C. Atomicity
D. Durability
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Correct Answer: Option A

Explanation:
Isolation ensures that the execution of concurrent transactions does not interfere with one another, making them appear as if they are executing sequentially.
This question belongs to: Computer Database Management System (DBMS)
Question #3
The actual collection of data tuples stored in a table at any specific point in time is called a what?
A. Relation Schema
B. Relation Degree
C. Relation Instance
D. Relation Domain
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Correct Answer: Option C

Explanation:
A Relation Instance is the specific collection of data rows (tuples) present in a table at a given moment. It changes frequently as data is modified.
This question belongs to: Computer Database Management System (DBMS)
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