mes in the program
using the <tt>name</tt> field. You will often find that it makes
sense to add a <tt>UNIQUE</tt> constraint to a logical key. Since the 
logical key is how we look up a row from the outside world, it makes
little sense to allow multiple rows with the same value in the table.</font><br />
<br />
</li><li><font color="black">A <b>primary key</b> is usually a number that is assigned
automatically by the database. It generally has no meaning outside
the program and is only used to link rows fr