PLSQL Query modification

Question

Following query is returning the records as below:
SELECT
  A.CHEQUE_CODE AS COL1, 
  A.ACC_ADD_REF AS COL2
FROM CTSCHEQUEBOOK A, BRANCHES B, CTSCHEQUEBOOK_DESIGN C
WHERE A.COMP_CODE = 1
AND A.COMP_CODE = B.COMP_CODE
AND A.BRANCH_CODE = B.BRANCH_CODE
AND A.COMP_CODE = C.COMP_CODE
AND A.CHEQUE_CODE = C.CODE
ORDER BY 1
COL1 COL2
1     01616005034001
1     01616005034001
1     01616005128001
2     01616005197001
2     01616005197001
3      01616005144001
3     01616005144001
3     01616005144001I want to display the records like only in column but group on COL1:
1
01616005034001
01616005034001
01616005128001
2
01616005197001
01616005197001
3
01616005144001
01616005144001
01616005144001How can I do this with my query?

Answer 1

I tried your query :
WITH DATA AS
  (SELECT TO_CHAR(A.CHEQUE_CODE) AS COL1,
    A.ACC_ADD_REF       AS COL2
  FROM CTSCHEQUEBOOK A,
    BRANCHES B,
    CTSCHEQUEBOOK_DESIGN C
  WHERE A.COMP_CODE = 1
  AND A.COMP_CODE   = B.COMP_CODE
  AND A.BRANCH_CODE = B.BRANCH_CODE
  AND A.COMP_CODE   = C.COMP_CODE
  AND A.CHEQUE_CODE = C.CODE
  ORDER BY 1
SELECT (
  CASE
    WHEN RN IS NULL
    THEN COL1
    ELSE COL2
  END) COL1
FROM
  (SELECT ROWNUM RN,
    COL1,
    COL2,
    COUNT(COL2)
  FROM DATA
  GROUP BY CUBE(ROWNUM),
    COL1,
    COL2
  );But it is repeating values like following:
1
01616005034001
01616005034001
01616005034001
01616005034001
01616005034001
1
01616005128001
01616005128001
01616005128001
01616005128001
01616005128001
01616005128001
01616005128001
2
01616005197001
01616005197001
3
01616005089001
3
01616005144001
01616005144001
01616005144001