What does the ROLLBACK statement do? MCQ with Answer and Explanation

Question
What does the ROLLBACK statement do?
A. Undoes all changes made in the current transaction
B. Saves the changes
C. Starts a new transaction
D. Creates a savepoint
Answer: Option A
Solution (By JKSSB Mock Tests)
ROLLBACK reverts the database to the state it was in at the beginning of the transaction, undoing all changes.
This question belongs to: Computer Database Management System (DBMS)
Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Database Management System (DBMS) Questions

Question #1
Which operator is specifically used to verify whether a column value contains a NULL entry?
A. = NULL
B. LIKE NULL
C. IS NULL
D. IN NULL
Discuss
Get Complete Subject PDF for Computer

Correct Answer: Option C

Explanation:
Because NULL represents an unknown value, it cannot be compared using the equality operator (=). Instead, the special 'IS NULL' operator must be used.
This question belongs to: Computer Database Management System (DBMS)
Question #2
What is the purpose of the SAVEPOINT statement?
A. To start a new transaction
B. To create a point within a transaction to which you can later roll back
C. To permanently save changes
D. To release locks
Discuss
Get Complete Subject PDF for Computer

Correct Answer: Option B

Explanation:
SAVEPOINT creates a named point within a transaction, allowing partial rollback to that point without affecting the entire transaction.
This question belongs to: Computer Database Management System (DBMS)
Question #3
In SQL, what does the 'IS NULL' operator check?
A. Whether a value is missing (null)
B. Whether a value is zero
C. Whether a value equals NULL
D. Whether a value is empty string
Discuss
Get Complete Subject PDF for Computer

Correct Answer: Option A

Explanation:
IS NULL is used to test for NULL values, because NULL is not equal to anything.
This question belongs to: Computer Database Management System (DBMS)
Explore All Database Management System (DBMS) MCQs
Today's Top Topics
Cyber Security 269 Database Management System (DBMS) 278 Computer Abbreviations 369 Computer Fundamentals 326 Computer Software 347
Explore Subjects
Accountancy and Statistics 3179 Economy GK 2220 English 15164 Computer 5279 Current Affairs 575
Practice Mix
Which of the following is an indirect tax in India?
The valve between the left atrium and left ventricle is the:
A person faces north. He turns 45° left, then 90° right, then 45° left. Which direction is he facing?
Under the Income Tax Act, the 'TDS' on the sale of an immovable property (other than agricultural land) by a resident is governed by which section, and what is the rate?
In 'Piecemeal Distribution' during dissolution, the first priority for payment of outside liabilities is: