 the person 
or (2) add the person the the <tt>People</tt> table and get the 
<tt>id</tt> value for the newly added row.</font><br />
<br />
</li><li><font color="black">Insert the row that captures the "follows" relationship.</font></li></ol>
<font color="black">We will cover each of these in turn.</font><br />
<br />
<h3><font color="black"><a name="htoc177">14.8.1</a>&nbsp;&nbsp;Constraints in database tables</font></h3>
<font color="black">As we design our table structures, we can tell the database syst