ROLLBACK — abort the current transaction
ROLLBACK [ AUTONOMOUS ] [ WORK | TRANSACTION ]
ROLLBACK rolls back the current transaction and causes all the updates made by the transaction to be discarded.
Optional key word that can be used when aborting an autonomous transaction. For details on autonomous transactions, see Chapter 16.
Optional key words. They have no effect.
Use COMMIT to successfully terminate a transaction.
ROLLBACK outside of a transaction block emits a warning and otherwise has no effect.
To abort all changes:
The SQL standard only specifies the two forms
ROLLBACK WORK. Otherwise, this command is fully conforming.