title: IsNull function in DB2 SQL?
body: <p>Is there a performant equivalent to the isnull function for DB2?</p>
  
  <p>Imagine some of our products are internal, so they don't have names:</p>
  
  <pre><code>Select product.id, isnull(product.name, "Internal) 
  From product
  </code></pre>
  
  <p>Might return:</p>
  
  <pre><code>1 Socks 
  2 Shoes 
  3 Internal 
  4 Pants
  </code></pre>