ORACLE/SQL: wm_concat & order by

Question

I\'m using oracle 11 (not sure about the exact version, but since LISTAGG doesn\'t work, I suppose it\'s not release 2) through ODBC and crystal reports 2008.

Here

Answer 1

If you give the sub query in the from clause a name you can then refer to columns in the sub query itself

SELECT t1.TASK_CARD
, WM_CONCAT(t1.code) as ZONES
FROM 
(SELECT TASK_CARD, CODE, CONTROL_CATEGORY FROM ODB.TASK_CARD_CONTROL ORDER BY CODE) t1
WHERE t1.CONTROL_CATEGORY = 'ZONE'
GROUP BY t1.TASK_CARD