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Concatenate values separated with commas

EXPERT RESPONSE FROM: Don Burleson

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QUESTION POSED ON: 19 January 2006
I have a query like this:
select userid from users where usergrp='1'
This query retrieves around 10 records. I have a task to concatenate the values separated with ','. I would like to know if Oracle has any function that could do that.

EXPERT RESPONSE
No, you will need to write a user-defined function with a VARRAY or DECODE for this. Something like this might work:

create or replace function    concat( cur sys_refcursor )return    varchar2 
is   retval varchar2(32767);    hold   varchar2(80);begin   loop      fetch 
cur into tmp;      exit when cur%notfound;        ret := ret || ',' || hold; 
end loop;  return retval;end;/ select distinct     substr 
(concat(       cursor(        select userid from users outer where e.usergrp 
= outer.usergrp        )    ),1,40) useridsfrom users e;

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