title: How do I sort by a specific order
body: <p>Table users:</p>
  
  <pre><code>id | firstname | lastname
  ---+-----------+---------
   1 | John      | Smith
   2 | Adam      | Tensta
   3 | Anna      | Johansson
  </code></pre>
  
  <p>I want to select these in the order of ID 2, 3, 1. ONLY specified by the id-field. Is this possible?</p>
  
  <p>I'm thinking something like <code>SELECT * FROM users ORDER BY id ORDER(2,3,1)</code></p>
  
  <p>Can this be done, and in that case how?</p>