Oracle: New String Aggregation Techniques

The LISTAGG analytic function was introduced in Oracle 11g Release 2

SELECT deptno, LISTAGG(ename, ',') WITHIN GROUP (ORDER BY ename) AS employees
FROM   emp
GROUP BY deptno;

    DEPTNO EMPLOYEES
---------- --------------------------------------------------
        10 CLARK,KING,MILLER
        20 ADAMS,FORD,JONES,SCOTT,SMITH
        30 ALLEN,BLAKE,JAMES,MARTIN,TURNER,WARD



If you are not running 11g Release 2 (undocumented)

SELECT deptno, wm_concat(ename) AS employees
FROM   emp
GROUP BY deptno;

    DEPTNO EMPLOYEES
---------- --------------------------------------------------
        10 CLARK,KING,MILLER
        20 SMITH,FORD,ADAMS,SCOTT,JONES
        30 ALLEN,BLAKE,MARTIN,TURNER,JAMES,WARD



Check it out here: http://www.oracle-base.com:80/articles/misc/StringAggregationTechniques.php 


Related Links:
- LISTAGG - ON OVERFLOW TRUNCATE - Oracle 12c R2
- Function to Compare two Comma Separated Strings in Oracle
- Oracle: Difference between wm_concat and ListAgg
- Oracle: Comma Separated String To Rows 11g
- Oracle: Comma Separated String To Rows 10g Onwards
- Oracle: Nth Record from Comma Separated String
- Oracle: Department wise Employee Ids Comma Separated
- Oracle: Comma Separated String To Rows