How to concatenated columns group by clause

Question

with apps AS (
SELECT 'a' AS APP_ID,1 AS RANK FROM DUAL
UNION
SELECT 'a' AS APP_ID,2 AS RANK FROM DUAL
UNION
SELECT 'a' AS APP_ID,3 AS RANK FROM DUAL
UNION
SELECT 'b' AS APP_ID,4 AS RANK FROM DUAL
UNION
SELECT 'b' AS APP_ID,5 AS RANK FROM DUAL
UNION
SELECT 'c' AS APP_ID,6 AS RANK FROM DUAL
SELECT APP_ID,RANK FROM apps ORDER BY 2;
A RANK
a 1
a 2
a 3
b 4
b 5
c 6
6 rows selected.
concatenated_column
a,1, 2,3
b,4, 5
c,6

Answer 1

Few days earlier someone has posted this - i think this might help u---
CREATE OR REPLACE FUNCTION scott.rowtocol(p_slct IN VARCHAR2,p_dlmtr IN VARCHAR2 DEFAULT ',')
RETURN VARCHAR2 AUTHID CURRENT_USER
AS
  TYPE c_refcur IS REF CURSOR;
  lc_str VARCHAR2 (4000);
  lc_colval VARCHAR2 (4000);
  c_dummy c_refcur;
BEGIN
  OPEN c_dummy FOR p_slct;
  LOOP
    FETCH c_dummy
    INTO lc_colval;
    EXIT WHEN c_dummy%NOTFOUND;
    lc_str := lc_str || p_dlmtr || lc_colval;
  END LOOP;
  CLOSE c_dummy;
  RETURN SUBSTR (lc_str, 2);
END;
SELECT DISTINCT a.job,
                rowtocol
                ( 'SELECT ename FROM emp WHERE job = '
                  || ''''
                  || a.job
                  || ''''
                  || ' ORDER BY ename'
                ) AS employees
FROM emp a;
JOB                  EMPLOYEES
SALESMAN      ALLEN,MARTIN,TURNER,WARD
CLERK             ADAMS,Avik,BARRY,MILLER,Roni,prithwi
ANALYST         FORD,SCOTT
PRESIDENT      KING
MANAGER        BLAKE,CLARK,JONESRegards.
Satyaki De.