Abort the current transaction
ROLLBACK [ WORK | TRANSACTION ]
ROLLBACK rolls back the current transaction and causes all the updates made by the transaction to be discarded.
WORK
TRANSACTION
Optional key words. They have no effect.
Use COMMIT(7) to successfully terminate a transaction.
Issuing ROLLBACK outside of a transaction block emits a warning and otherwise has no effect.
To abort all changes:
ROLLBACK;
The SQL standard only specifies the two forms ROLLBACK and ROLLBACK WORK. Otherwise, this command is fully conforming.
BEGIN(7), COMMIT(7), ROLLBACK TO SAVEPOINT (ROLLBACK_TO_SAVEPOINT(7))