title: Change default value for column on h2 database to current timestamp
body: <p>I have a h2 database with a schema that is auto generated via JPA/hibernate. Now I want to alter a not-null <code>timestamp</code> type column on the database to default to the current time.</p>
  
  <p>I actually use <a href="http://www.h2database.com/html/features.html#triggers" rel="noreferrer">a trigger</a>, and that works, but I'd like to know if there's a more elegant way to achieve this, something like (the following snippet <em>doesn't</em> work)</p>
  
  <pre><code>ALTER TABLE my_table ALTER COLUMN my_column SET DEFAULT CURRENT_TIMESTAMP;
  </code></pre>
  
  <p>I looked at <a href="http://www.h2database.com/html/grammar.html#alter_table_alter" rel="noreferrer">the documentation</a> and tried some variants of the above "pseudo statement" but with now success.</p>