title: Update identity column sql
body: <p>How to update my identity column Id ?
  I get the 
  Msg 8102, Level 16, State 1, Line 1
  Cannot update identity column 'Id'.</p>
  
  <p>when i try to update id</p>
  
  <pre><code>update [WarehouseReports].[Reports]
    set Id=Id+1
    where Id=20
  </code></pre>