ROLLBACK — abort the current transaction
ROLLBACK [ WORK | TRANSACTION ] [ AND [ NO ] CHAIN ]
ROLLBACK rolls back the current transaction and causes
all the updates made by the transaction to be discarded.
WORKTRANSACTIONOptional key words. They have no effect.
AND CHAIN
If AND CHAIN is specified, a new transaction is
immediately started with the same transaction characteristics (see SET TRANSACTION) as the just finished one. Otherwise,
no new transaction is started.
Use COMMIT to successfully terminate a transaction.
Issuing ROLLBACK outside of a transaction
block emits a warning and otherwise has no effect. ROLLBACK AND
CHAIN outside of a transaction block is an error.
To abort all changes:
ROLLBACK;
The command ROLLBACK conforms to the SQL standard. The
form ROLLBACK TRANSACTION is a PostgreSQL extension.