title: MySQL: Set to default value on update
body: <p>Is it possible to set a column to its default value (or any specified value) on update when no value is specifically given in the statement? I was thinking that a trigger might accomplish this. Something like</p>
  
  <pre><code>IF ISNULL(NEW.column) THEN
   NEW.column = value
  END IF;
  </code></pre>
  
  <p>didn't work.</p>