title: SQL query that returns specific string if column is null?
body: <p>When an SQL query returns null, I'm wondering if it's possible to have it return a specific string like "Unknown" instead of null.</p>
  
  <p>I'm currently doing this on the JavaScript side and was wondering if there's a faster way to do this on the server.</p>
  
  <p>Example (I realize the following syntax doesn't exist):</p>
  
  <pre><code>SELECT Customers.Email (RETURN "Unknown" IF NULL)
  </code></pre>
  
  <p>I imagine it's possible with a CASE? But filling up my query with CASE statements will slow this whole action down rather than speed it up.</p>