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ROLLBACK
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
WORKTRANSACTION- 
      
Optional key words. They have no effect.
 
Notes
Use COMMIT to successfully terminate a transaction.
Issuing ROLLBACK outside of a transaction block emits a warning and otherwise has no effect.
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.
See Also
BEGIN, COMMIT, ROLLBACK TO SAVEPOINT© 1996–2019 The PostgreSQL Global Development Group
Licensed under the PostgreSQL License.
 https://www.postgresql.org/docs/10/sql-rollback.html