title: SQL-Server 2005: The multi-part identifier ... could not be bound.
body: <p>My error message:</p>
  
  <blockquote>
    <p>The multi-part identifier table2.ValidSince" could not be bound.</p>
  </blockquote>
  
  <pre><code>UPDATE table1
  SET table1.ValidSince = table2.ValidSince
  WHERE table1.ID = '5C954C6F-FFD7-454A-9E2B-000076523819'
  </code></pre>
  
  <p>How do I need to change the update to make it work?</p>