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Which TCL command undo all the updates performed by the SQL in the transaction?

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Which TCL command undo all the updates performed by the SQL in the transaction?

(a) ROLLBACK

(b) COMMIT

(c) TRUNCATE

(d) DELETE
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Right answer is (b) COMMIT

The explanation is: Rollback is used for undoing the work done in the current transaction. This command also releases the locks if any hold by the current transaction.
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