title: When using the AVG() SQL function, is NULL part of the average or is it ignored?
body: <p>I'm trying to get the average price of all products, several of which are <code>NULL</code>. I want to know if when I use the following query:</p>
  
  <pre><code>SELECT AVG(Price) AS PriceAverage FROM Products;
  </code></pre>
  
  <p>if it is including the products that have <code>NULL</code> as a price or is it skipping them?</p>