ROLLBACK -- Aborts the current transaction
ROLLBACK [ WORK | TRANSACTION ]
None.
ROLLBACK rolls back the current transaction and causes all the updates made by the transaction to be discarded.
Use COMMIT to successfully terminate a transaction. ABORT is a synonym for ROLLBACK.
To abort all changes:
ROLLBACK WORK;
SQL92 only specifies the two forms ROLLBACK and ROLLBACK WORK. Otherwise full compatibility.