title: Positive values from Datediff without using ABS
body: <pre><code>CASE 1 = 1
  THEN ISNULL(Convert(varchar,DATEDIFF(day, DATE1, DATE2)),'')
  </code></pre>
  
  <p>I need to have all <code>positive</code> values from the difference, When I use <code>ABS</code> it wont work as <code>Varchar</code> is the type. I need <code>empty string</code> for <code>Null Values</code>.</p>