PL/SQL - Delete a character in a VARCHAR2

Question

(I'm sorry for my english...) I'd like to know if I can delete a character in a varchar2 :

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;

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.

Thank you

Answer 1

After your loop is done you can RTRIM the comma off:

END LOOP;

ORDRE_DYN := RTRIM(ORDRE_DYN, ',');

If a comma does not exist at the end of the string then no changes are made to the string.

Oracle 11gR2 RTRIM documentation.