Get the column values in a single row seperated by commas

Question

Hi
i have two tables project_baseline and project_resource which have the foreign key project_id from the base table project_details. Now iam trying to retrieve data from these tables using the below query :
select distinct b.TASK_NAME,r.RESOURCE_NAME,() from project_baseline b inner join project_resource r on R.PROJECT_ID=B.PROJECT_ID group by b.TASK_NAME,r.RESOURCE_NAME
Below is the output snippet :
TASK_NAME RESOURCE_NAME
TEST DESIGN PARAGI M
TEST DESIGN RAJAN M S
TEST EXECUTION VIBHU ARMA
TEST EXECUTION PRATHAB GARG
TEST EXECUTION NAGABHUSHAN G K
TEST DATA PREPARATION RAJAN M S
TEST DATA PREPARATION SHIVA MARAN
TEST CASE REWORK VISWAN RAM
TEST CASE REVIEW NAGABHUSHAN G K
REGRESSION SANGEET
PROJECT SUPPORT VIBHU ARMA
PROJECT SUPPORT PRATHAB GARG
PROJECT SUPPORT PARAGI M
PROJECT SUPPORT NAGABHUSHAN G K
PROJECT SUPPORT SANGEET
PROJECT CLOSURE PRATHAB GARG
i need to get the resource_names in a single row seperated by comma for a single task like following:
TASK_NAME RESOURCE_NAME
PROJECT SUPPORT VIBHU ARMA,PRATHAB GARG,PARAGI M,NAGABHUSHAN G K,SANGEET
Could anyone please help me to get the query for the above formated output?
Thanks in advance
Meera
Edited by: 928378 on May 22, 2012 5:20 AM

Answer 1

Hi,
It can be done using xmlagg function.
For Example :
Table Data..
DEPTNO     ENAME
20     WARD Tree
23     Shank
30     BLAKE
10     MILLER
30     MARTIN
10     CLARK
20     SCOTT
30     TURNER
20     ADAMS
30     JAMES
20     FORD
30     BLAKE
Query:
SELECT deptno,
RTRIM (XMLAGG (XMLELEMENT (e, ename || ',')).EXTRACT ('//text()'),
) NAME
FROM emp
GROUP BY deptno;
Output :
DEPTNO     NAME
10     MILLER,CLARK
20     WARD Tree,FORD,ADAMS,SCOTT
23     Shank
30     BLAKE,TURNER,BLAKE,JAMES,MARTIN
Thanks,
Shankar
Thanks,
Shankar.