From: | David Fetter <david(at)fetter(dot)org> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>, PG Hackers <pgsql-hackers(at)postgresql(dot)org>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: [HACKERS] Question regarding new windowing functions in 8.4devel |
Date: | 2009-01-16 17:38:21 |
Message-ID: | 20090116173821.GD20296@fetter.org |
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Lists: | pgsql-general pgsql-hackers |
On Fri, Jan 16, 2009 at 12:34:34PM -0500, Tom Lane wrote:
> David Fetter <david(at)fetter(dot)org> writes:
> > I tried this:
>
> > SELECT
> > typ,
> > ts,
> > rank() over w AS foo_rank
> > FROM
> > foo
> > WINDOW w AS (partition by typ order by ts desc)
> > WHERE
> > foo_rank < 4;
>
> > ERROR: syntax error at or near "WHERE"
> > LINE 8: WHERE
> > ^
>
> RTFM ... WINDOW goes after WHERE (and GROUP BY, HAVING, ...)
Thanks :)
> Also, we have never allowed SELECT-alias references in WHERE; window
> functions have nothing to do with that.
We don't appear to be able to use the actual thing in the target list
either. At a minimum, this is a pretty enormous POLA violation, and I
think it rises to the level of a bug.
Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
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