COMMIT [ WORK | TRANSACTION ]
COMMIT commits the current transaction. All changes made by the transaction become visible to others and are guaranteed to be durable if a crash occurs.
Use ROLLBACK [rollback(7)] to abort a transaction.
Issuing COMMIT when not inside a transaction does no harm, but it will provoke a warning message.
To commit the current transaction and make all changes permanent:
The SQL standard only specifies the two forms COMMIT and COMMIT WORK. Otherwise, this command is fully conforming.