om different tables
together. When we want to look up a row in a table, usually 
searching for the row using the primary key is the fastest 
way to find a row. Since primary keys are integer numbers, they 
take up very little storage and can be compared or sorted very quickly.
In our data model, the <tt>id</tt> field is an example of a primary key.</font><br />
<br />
</li><li><font color="black">A <b>foreign key</b> is usually a number that points to the primary key
of an associated row in a different tabl