title: Can I have composite constraints?
body: <p>Having a table with this structure...</p>
  
  <p>Table_files </p>
  
  <ul>
  <li>id_file (PK) </li>
  <li>file_name</li>
  <li>file_path</li>
  </ul>
  
  <p>... can I have a constraint that allows me to not duplicate the pair "file_name"+"file_path" (but allows me to duplicate the "file_name" and "file_path" individually), where the only Primary Key is the field "id_file"?</p>
  
  <p>Thanks</p>