Oracle相同的列不同的行合并

行合并：
WITH A AS (
SELECT 1123 ID,'2008-9-19' DAY,'9:7:47' TIME FROM DUAL UNION 
SELECT 1123 ID,'2008-9-19' DAY,'19:7:47' TIME FROM DUAL  UNION 
SELECT 1123 ID,'2008-9-19' DAY,'13:7:47' TIME FROM DUAL  UNION 
SELECT 1123 ID,'2008-9-19' DAY,'12:7:47' TIME FROM DUAL )
select ID,DAY,WMSYS.WM_CONCAT(TIME) TIME FROM A GROUP BY ID,DAY 

我的例子：
select t.actionname,WMSYS.WM_CONCAT(t.action) ACTION ,WMSYS.WM_CONCAT(t.id) ID
from FLOW_ACTION t group by  t.actionname ,t.columnid