title: insert DEFAULT values
body: <p>Is there ANY difference between those two statements?:</p>
  
  <pre><code>INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets');
  </code></pre>
  
  <p>and:</p>
  
  <pre><code>INSERT INTO distributors (dname) VALUES ('XYZ Widgets');
  </code></pre>
  
  <p>I mean is there at least one reason to use one or another pattern in some particular situation or is it completely the same? 
  did is a serial column.</p>