ROLLBACK
Name
ROLLBACK -- abort the current transaction
Synopsis
ROLLBACK [ WORK | TRANSACTION ]
Description
   ROLLBACK rolls back the current transaction and causes
   all the updates made by the transaction to be discarded.
  
Parameters
- WORK
 TRANSACTION
-       Optional key words. They have no effect.
      
Notes
   Use COMMIT to
   successfully terminate a transaction.
  
   Issuing ROLLBACK when not inside a transaction does
   no harm, but it will provoke a warning message.
  
Examples
   To abort all changes:
ROLLBACK;
Compatibility
   The SQL standard only specifies the two forms
   ROLLBACK and ROLLBACK
   WORK. Otherwise, this command is fully conforming.