| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Christoph Pingel <ch(dot)pingel(at)web(dot)de> |
| Cc: | postgresql-general mailing list <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: no self-joins in views? |
| Date: | 2005-02-10 17:00:22 |
| Message-ID: | 20050210170022.GA71525@winnie.fuhr.org |
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| Lists: | pgsql-general |
On Thu, Feb 10, 2005 at 05:13:51PM +0100, Christoph Pingel wrote:
>
> is there any restriction re the use of self joins in views? I have a
> moderately complicated query where I scan the same table twice using
> aliases, and I would like to put that into a view to keep my python
> code clean. However, I get an error 'column xy duplicated'. Is this
> so by design?
Use column aliases so the xy columns don't have the same name:
CREATE VIEW viewname AS
SELECT a.xy AS axy,
b.xy AS bxy
FROM foo AS a,
foo AS b
WHERE ...
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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