title: Update a TIMESTAMP column to be nullable
body: <p>I have a table that exists in two databases.</p>
  
  <p>In one database there is a table with a column called <code>ROW_VERSION</code> that is of type <code>TIMESTAMP NOT NULL</code>.</p>
  
  <p>In the second database the same table has the same column of type <code>TIMESTAMP</code> but it is of type <code>TIMESTAMP NULL</code>.</p>
  
  <p>I would like to change the column in the first database to be nullable. This will allow me to synchronize between the two databases easier.</p>
  
  <p>But when I run this:</p>
  
  <pre><code>ALTER TABLE [MyTable]
  ALTER COLUMN ROW_VERSION TIMESTAMP NULL
  </code></pre>
  
  <p>I get the error:</p>
  
  <blockquote>
    <p>Cannot alter column 'ROW_VERSION' to be data type timestamp.</p>
  </blockquote>
  
  <p>It is already a timestamp. <strong>I just need to make it nullable. Is there anyway to do this?</strong></p>