title: trigger to update a column on insertion or updation of another column in same table
body: <p>I want to update <code>image_updated_at</code> field of <code>recycle_center</code> table if there is any insertion or update on <code>image_url</code> field of same table(recycle_center). I have tried this one::</p>
  
  <pre><code>CREATE OR REPLACE TRIGGER my_trigger
  AFTER INSERT OR UPDATE OF image_url ON recycle_center
  BEGIN
  
      UPDATE recycle_center SET image_updated_at=NOW()
      WHERE old.id=new.id
  
  END
  </code></pre>
  
  <p>But, it shows an error message. How to fix it??</p>