title: PL/SQL - Delete a character in a VARCHAR2
body: <p>(I'm sorry for my english...) I'd like to know if I can delete a character in a varchar2 :</p>
  
  <pre><code>FOR FF IN REQ LOOP
  IF FF.COLUMN_NAME = ANCIEN THEN
    ORDRE_DYN := ORDRE_DYN || ANCIEN;
  ELSE 
    ORDRE_DYN := ORDRE_DYN || FF.COLUMN_NAME;
  END IF;
  
  ORDRE_DYN := ORDRE_DYN || ' ' || FF.DATA_TYPE || '(' || FF.DATA_LENGTH;
  
  IF FF.DATA_PRECISION IS NULL THEN
    ORDRE_DYN := ORDRE_DYN || ', ' || FF.DATA_PRECISION || '),';
  END IF;
  END LOOP;
  </code></pre>
  
  <p>At the last iteration, there is a comma that i want to delete, is it possible ? I know i can do a while loop but i still want to keep the for.</p>
  
  <p>Thank you</p>