title: SQL: AVG with NULL Values
body: <p>As far as I understood, the AVG() function ignores NULL Values.</p>
  <p>So AVG(4,4,4,4,4,NULL) --&gt; 4</p>
  <p>In my case I don't want this to happen.</p>
  <p>I need a solution like that: AVG(4,4,4,4,4,NULL) --&gt; 3,33</p>
  <p>without replacing the NULL values directly in the table itself.</p>
  <p>Is there any way to do this?</p>