DBMSs</li>
<li>The default FK policy is <code>RESTRICT</code>
<ul>
<li>if performing the update or delete would leave “<em>orphan</em>” rows (rows that refer to non-existing values), then block the update or delete and return an error message</li>
<li><code>NO ACTION</code> is a synonym for <code>RESTRICT</code></li>
</ul></li>
<li>If the <code>CASCADE</code> policy is set
<ul>
<li>then the changes are propagated to rows depending on the original row
<ul>
<li>if the row is deleted, then the rows dependi