DECLARE
  commentId NUMBER;
BEGIN
FOR comments IN (SELECT HTL_GST_CMT_ID FROM GST_ARR.HTL_GST_CMT)
  LOOP
    commentId := comments.HTL_GST_CMT_ID;

    UPDATE GST_ARR.HTL_GST_CMT
    SET CREAT_TS = CREAT_TS + ROUND(DBMS_RANDOM.VALUE(0,100)) - 100
    WHERE HTL_GST_CMT_ID = commentId AND TO_CHAR(CREAT_TS, 'YYYY-MM-DD') IN ('2017-03-02', '2017-03-03');

  END LOOP;
  COMMIT;
END;