RDO> FOR E IN EMPLOYEES SORTED BY E.BIRTHDAY

    Because this example did not specify the sort order, Oracle Rdb
    automatically sorts the EMPLOYEES records in ASCENDING order by
    BIRTHDAY.

    FOR E IN EMPLOYEES
        SORTED BY DESCENDING E.STATUS_CODE,
                  ASCENDING E.LAST_NAME, E.SOCIAL_SECURITY

    If you do not specify ASCENDING or DESCENDING for the second or
    subsequent sort keys, Oracle Rdb uses the order you specified for
    the preceding sort key.