The ROLLBACK TO SAVEPOINT statement will undo any changes that have been made since the SAVEPOINT was established. Changes
made before the SAVEPOINT are not undone; they are still pending.
The savepoint-name is an identifier that was specified on a SAVEPOINT statement within the current transaction. If savepoint-name is omitted, the most recent savepoint is used. Any savepoints since the named savepoint are automatically released.
There must have been a corresponding SAVEPOINT within the current transaction.