<p><pre><code>  All of these tables relate to one another

  Where all this gets particularly interesting is wherever,
  by traversing the relations between table...

  These are the merits of the “relational” database. 
</code></pre>
That&#x27;s not what &quot;relational&quot; in &quot;relational databases&quot; means.<p>He even links to Codd&#x27;s paper which defines a &quot;relation&quot; explicitly:<p><pre><code>  The term relation is used here in its accepted mathematical sense.
  Given sets X1 , S, , . . . , S, (not necessarily distinct), R is
  a relation on these n sets if it is a set of n-tuples each of which
  has its first element from S1, its second element from Sz, and so on.
  ...</code></pre>