SELECT person, phone FROM phone_data WHERE phone NOT LIKE '412%';

</programlisting>

This view might seem secure, since the rule system will rewrite any

<command>SELECT</command> from <literal>phone_number</> into a

<command>SELECT</command> from <literal>phone_number</> into a

<command>SELECT</command> from <literal>phone_data</> and add the

qualification that only entries where <literal>phone</> does not begin

with 412 are wanted. But if the user can create his or her own functions,