Comments on: Oracle RDBMS 11gR2 – LISTAGG – New aggregation operator for creating (comma) delimited strings

By: Taral Desai

Taral Desai — Fri, 04 Dec 2009 18:11:57 +0000

Hi Lucas,

That was good examples and feature. But how can you implement below same thing in 10g using collect or any other method

select deptno
, avg(sal) avg_sal
, listagg( ename, ‘,’) within group (order by sal)
enames
from emp
group
by deptno
/

By: RC

RC — Sat, 05 Sep 2009 21:54:36 +0000

The possibility to use the collect function in combination unique or distinct or order by is new Oracle 11gr1 . I believe it isn’t possible in Oracle 10.

I hoped that listagg would return a clob instead of a varchar2. What happens when the 4000 limit is surpassed? I can’t test it because I don’t have Linux so I can’t install 11gr2 yet.

By: Laurent Schneider

Laurent Schneider — Wed, 02 Sep 2009 15:23:58 +0000

No, I have no plan to go to OOW this year… did you submit some trivia questions to Lilian?

Kind regards

By: Lucas Jellema

Lucas Jellema — Wed, 02 Sep 2009 11:30:25 +0000

Oops, in that case I have overlooked that particular feature in the COLLECT operator. And I stand corrected. That is the risk you run with such a sophisticated audience! Will we meet at OOW Laurent? Thanks for your comment! Best regards, Lucas

By: Laurent Schneider

Laurent Schneider — Wed, 02 Sep 2009 08:11:01 +0000

There are some limitations on using this [COLLECT] operator: it does not support an order by especially for the collected values

Really?

select collect(ename order by ename) from emp

seems to be a valid syntax