The following programs demonstrate the use of the commit
    statement to make permanent changes to a field value in a
    database. These programs:

    o  Use a record selection expression to find an employee in the
       EMPLOYEES relation with the ID number "00193"

    o  Use a MODIFY statement to change the field value of
       E.LAST_NAME for this employee

    Although this change is written to the database at the time of
    the MODIFY, the change is not permanent until the programs issue
    a COMMIT statement. After the programs issue the COMMIT statement
    the old value for E.LAST_NAME is not available.

    The C example uses the function pad_string to pad the name
    "Smith-Fields" with blanks. Blanks are appended to the name so
    that the length of the name matches the spaces reserved for it in
    the database definition for LAST_NAME.