title: Get the operation type inside a "Insert or Update" trigger
body: <p>Can we capture inside a <code>Insert or Update</code> trigger that this triggers has been executed because of <code>Insert</code> or due to an <code>Update</code> statement?</p>
  
  <p>One way to know this is to make separate triggers for both <code>Insert</code> and <code>Update</code>  </p>
  
  <p>But it would be very nice if I can do this inside one trigger.</p>