Returning comma separated values in sqlplus

I have a  query that returns a resultset of IDs. Ideally I would like to return a single row of comma separated ids instead of a list. For example, Select ID from table returns
ID
1
2
3

I would like to return
ID
1,2,3

Is this possible?
atxmanAsked:
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slightwv (䄆 Netminder) Commented:
There are many ways.

Which way depends a lot on the maximum string length.

If it will be less than 4000 characters go with LISTAGG.

http://docs.oracle.com/cd/E11882_01/server.112/e41084/functions089.htm#SQLRF30030
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sdstuberCommented:
select listagg(id,',') within group (order by id)
from your_table

or if a 11g or lower,  create your own aggregate
http://www.experts-exchange.com/articles/9391/How-to-Create-User-Defined-Aggregates-in-Oracle.html

that article also includes an example of using the COLLECT function with a wrapper to generate a delimited string without needing your own aggregate.

if you can't create a new object, then try xml aggregation

SELECT RTRIM(
           XMLQUERY(
               '//x/text()'
               PASSING XMLAGG(XMLELEMENT("x", id || ',') ORDER BY id)
               RETURNING CONTENT
           ),
           ','
       )
  FROM yourtable;

it's a more resource intensive operation than listagg, collect, or writing your own aggregate but will work in a pinch
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