Displays the default setting for warning messages. If WARNING
    MODE is set to ON, SQL flags statements containing obsolete SQL
    syntax. Obsolete syntax is syntax that was allowed in previous
    versions of SQL but has changed. Oracle Rdb recommends that you
    avoid using such syntax because it may not be supported in future
    versions. By default, SQL displays a warning message after any
    statement containing obsolete syntax (WARNING MODE ON).

    To suppress messages about obsolete syntax, use the SET WARNING
    NODEPRECATE statement.