ABORT — abort the current transaction
ABORT [ WORK | TRANSACTION ] [ AND [ NO ] CHAIN ]
   ABORT rolls back the current transaction and causes
   all the updates made by the transaction to be discarded.
   This command is identical
   in behavior to the standard SQL command
   ROLLBACK,
   and is present only for historical reasons.
  
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 ABORT outside of a transaction block
   emits a warning and otherwise has no effect.
  
To abort all changes:
ABORT;
   This command is a PostgreSQL extension
   present for historical reasons. ROLLBACK is the
   equivalent standard SQL command.