Re: Recursive use

burbello3000@yahoo.com.br (Alexander Burbello) writes:
> Hi people,
>
> I need to know if Postgres do recursive search and how can I do!
> I will explain my problem.
>
>
> table COOPERATIVE
>  code_cooperative int
>  code_coo_father int
>
> I can have 3 level by business rules
>
> 1 - Father
> ----- 2 - Children
> --------- 3 - Grandchildren
>
>
> I would like to have a query asking who is father and granfather
> select grandfather, father from COOPERATIVE where COD_COOPERATIVE = 3
>
> Do the Postgres can solve this problem?
> Could anybody help me?

There was a proposal to implement WITH RECURSIVE for PostgreSQL 8.2;
that fell by the wayside.

The task is on the ToDo list:

<http://www.postgresql.org/docs/faqs.TODO.html>
    Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT

At present, you may simulate this by writing a pl/pgsql function that
does the recursion in procedural code.
--
let name="cbbrowne" and tld="linuxdatabases.info" in name ^ "@" ^ tld;;
http://cbbrowne.com/info/postgresql.html
"Nondeterminism means never having to say you're wrong."  -- Unknown