From: Thomas Kellerer <spam_eater@gmx.net>
To: pgsql-sql@postgresql.org
Subject: Combining several CTEs with a recursive CTE
Date: Tue, 20 Sep 2011 11:58:20 +0200
Message-ID: <j59o2m$dn1$1@dough.gmane.org> (raw)
Hello all,
this is more a "just curious" question, rather than a real world problem.
We can combine several CTEs into a single select using something like this:
WITH cte_1 as (
select ....
),
cte_2 as (
select ...
where id (select some_col from cte_1)
)
select *
from cte_2;
But this does not seem to work when a recursive CTE is involved
WITH cte_1 as (
select ....
),
recursive cte_2 as (
select ...
where id (select some_col from cte_1)
union all
select ...
)
select *
from cte_2;
This throws an error: syntax error at or near "cte_2"
I'm just wondering if this is intended behavioury, simply not (yet) implemented or even invalid according to the standard? I didn't find any reference that it's not allowed in the manual.
Regards
Thomas
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Subject: Re: Combining several CTEs with a recursive CTE
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