Concatenate multiple row values into single column value

Question

Hello,
Can anyone please refresh my memory on how to concatenate multiple row values into a single column value.
In the following query, I will get multiple denial reasons per application and I would rather return all denial reasons on one line.
SELECT a.application_id, a.membership_number,
r.reason_text AS denial_reason,
a.appl_receipt_date AS application_receipt_date,
a.plan_request_1 AS application_plan_code,
a.adjudication_date AS application_denial_date
FROM application a, PLAN p, application_reason ar, reason r
WHERE a.plan_request_1 = p.plan_cd
AND a.application_id = ar.application_id
AND ar.reason_id = r.reason_id
AND a.adjudication_cd = 'D'
AND a.appl_receipt_date BETWEEN '01-jan-2006' AND '31-dec-2006'
AND p.plan_type_id = 12 and a.application_id = :appId
ORDER BY application_id
Any help is greatly appreciated.
Thanks,
-Christine

Answer 1

found the following
SELECT deptno,
       LTRIM(MAX(SYS_CONNECT_BY_PATH(ename,','))
       KEEP (DENSE_RANK LAST ORDER BY curr),',') AS employees
FROM   (SELECT deptno,
               ename,
               ROW_NUMBER() OVER (PARTITION BY deptno ORDER BY ename) AS curr,
               ROW_NUMBER() OVER (PARTITION BY deptno ORDER BY ename) -1 AS prev
        FROM   emp)
GROUP BY deptno
CONNECT BY prev = PRIOR curr AND deptno = PRIOR deptno
START WITH curr = 1;
    DEPTNO EMPLOYEES
        10 CLARK,KING,MILLER
        20 ADAMS,FORD,JONES,SCOTT,SMITH
        30 ALLEN,BLAKE,JAMES,MARTIN,TURNER,WARD
3 rows selected.at http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php