CREATE TABLE CRIS_WAREHOUSE_USER.RF_COUNTRY_LIMITS
(
  BE_GROUP_ID            VARCHAR2(10 BYTE),
  COUNTRY_CODE_ISO_2     VARCHAR2(10 BYTE)      NOT NULL,
  CLOSE_OF_BUSINESS_KEY  NUMBER(22),
  LIMIT                  NUMBER
)
TABLESPACE WAREHOUSE_BIG_DATA

Insert into RF_COUNTRY_LIMITS
   (BE_GROUP_ID, COUNTRY_CODE_ISO_2, CLOSE_OF_BUSINESS_KEY, LIMIT)
 Values
   ('123', 'MC', 1220140331, 900000);
Insert into RF_COUNTRY_LIMITS
   (BE_GROUP_ID, COUNTRY_CODE_ISO_2, CLOSE_OF_BUSINESS_KEY, LIMIT)
 Values
   ('111', 'MC', 1220140331, 80000);
COMMIT;

123    MC    1220140331    900000
111    MC    1220140331    80000

I want to convert two row into row like this below  

MC 900000 , 80000

SQL> WITH t1 AS 
  2  (SELECT 123 AS BE_GROUP_ID, 'MC' AS COUNTRY_CODE_ISO_2, 1220140331 AS CLOSE_OF_BUSINESS_KEY, 90
0000 AS LIMIT_AMT FROM DUAL
  3   UNION ALL
  4   SELECT 111 AS BE_GROUP_ID, 'MC' AS COUNTRY_CODE_ISO_2, 1220140331 AS CLOSE_OF_BUSINESS_KEY, 80
0000 AS LIMIT_AMT FROM DUAL
  5   UNION ALL
  6   SELECT 111 AS BE_GROUP_ID, 'MC' AS COUNTRY_CODE_ISO_2, 1220140331 AS CLOSE_OF_BUSINESS_KEY, 70
0000 AS LIMIT_AMT FROM DUAL),
  7   t2 AS (SELECT COUNTRY_CODE_ISO_2, 
  8                 LIMIT_AMT, 
  9                 ROW_NUMBER() OVER (PARTITION BY COUNTRY_CODE_ISO_2 ORDER BY LIMIT_AMT) AS curr,
 10                 ROW_NUMBER() OVER (PARTITION BY COUNTRY_CODE_ISO_2 ORDER BY LIMIT_AMT) -1 AS pre
v
 11            FROM t1)
 12  SELECT COUNTRY_CODE_ISO_2,
 13         LTRIM(MAX(SYS_CONNECT_BY_PATH(LIMIT_AMT,','))
 14         KEEP (DENSE_RANK LAST ORDER BY curr),',') AS REQ_OUTPUT
 15     FROM t2
 16  GROUP BY COUNTRY_CODE_ISO_2
 17  CONNECT BY prev = PRIOR curr AND COUNTRY_CODE_ISO_2 = PRIOR COUNTRY_CODE_ISO_2
 18  START WITH curr = 1;

CO
--
REQ_OUTPUT
--------------------------------------------------------------------------------
MC
700000,800000,900000