query concat

Hi List,
First, Thanks for your colaboration Richard Huxton "Do a search on aggregate
functions and "concat" in the mailing list archives,
also see the Postgresql Cookbook on techdocs.postgresql.org, I think there
might be something there for you."

I have been written this mail because I din't find the solution for my
problem.

Please, I need your colaboration,I like a table or view with this
information from 2 tables "ticket" and "orden_respuesta".
If you see the table "orden_respuesta", I have many numorden's for one
numtti. and in the table "ticket" I have a tti with information about user.

The Table "result"(I like this information)
numtti | numorden | tt | usuario | estado |
----------+---------------------------+--------+---------+---------+
TTI02000006| ORD02000044, ORD02000045..| 100029 | joroza | CERRADO |
TTI02000007| ORD02000061, ORD02000064 | 100051 | pdorado | REVISION|
TTI02000008| ORD02000042, ORD02000043 | 56729 | joroza | CERRADO |

(I have this tables as information)
Table "ticket"
tti | tt | usuario | estado |
-------------+--------+---------+----------+
TTI02000006 | 100029 | joroza | CERRADO |
TTI02000007 | 100051 | pdorado | REVISION |
TTI02000008 | 100049 | joroza | CERRADO |

Table "orden_respuesta"
numorden | numtti
------------+-------------
ORD02000046 | TTI02000006
ORD02000045 | TTI02000006
ORD02000044 | TTI02000006
ORD02000064 | TTI02000007
ORD02000061 | TTI02000007
ORD02000043 | TTI02000008
ORD02000042 | TTI02000008

Regards,
Ricardo

P.D: Sorry for my grammar I'm from Bolivia, but I understand Enghish

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