안녕하십니까? 다음의 데이터를 가로로 변경하고 싶습니다.

customer
========
4504392328q 
4504392328

다음과 같이 바꾸고 싶습니다.

4504392328q, 4504392328

생각만큼 안되네요....
 

SELECT REPLACE( SUBSTR (MAX (SYS_CONNECT_BY_PATH(customer_po, ',') ), 2),', ','') customer_po
  FROM (SELECT distinct O.BUYERPO customer_po
          FROM ORDERDETAIL OD,
               ORDERS      O,
            ( SELECT ORDERGROUP, SOURCEKEY, id, SKU
                FROM (
                      SELECT ORDERGROUP, SOURCEKEY, id, SKU
                        FROM LOTXIDDETAIL
                       WHERE ORDERGROUP = '53619'
                         AND ID         = '53619-001'
                         AND IOFLAG     = 'O'
                     )
                GROUP BY ORDERGROUP, SOURCEKEY, id, SKU
            ) L
 WHERE OD.ORDERKEY      = O.ORDERKEY
   AND O.ORDERGROUP     = L.ORDERGROUP
   AND O.ORDERKEY       = L.SOURCEKEY
   AND OD.SKU           = L.SKU
   AND O.ORDERGROUP     = '53619' )
START WITH 1 = 1
CONNECT BY PRIOR 1 = 1 -1

조언부탁 드립니다.

감사합니다.