title: Oracle Apex Data loader - 4 unique columns to check
body: <p>I have made a few data loader pages. Now I have to create/edit a data loader page to check on 4 columns of a unique key. Apex only allows 3.
  How can I check on 4 columns instead of 3 columns</p>
  
  <p>I'm using Oracle Apex 4.2</p>
  
  <p>Thank you!</p>