title: SQL select string after second occurrence of a character
body: <p>I am selecting 4 columns of data:</p>
  
  <pre><code>HES_CODE_COMBINATIONS.ANALYSIS_CODE_1,
  HES_CODE_COMBINATIONS.ANALYSIS_CODE_7,
  HES_CODE_COMBINATIONS.ANALYSIS_CODE_8, 
  HES_CODE_COMBINATIONS.DESCRIPTION
  </code></pre>
  
  <p>I want to trim the description column </p>
  
  <pre><code>(**HES_CODE_COMBINATIONS.DESCRIPTION**) 
  </code></pre>
  
  <p>to keep only the text string after the second occurrence of <code>"."</code> (full stop)</p>
  
  <p>E.g. From: </p>
  
  <p><strong>Research (R Codes).Other Income Projects.Defects in cellular DNA repair mechanisms ~ 01/09/14 - 31/08/16</strong></p>
  
  <p>To retrieve only:</p>
  
  <p><strong>Defects in cellular DNA repair mechanisms ~ 01/09/14 - 31/08/16</strong></p>
  
  <p>Thanks</p>