From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David G. Johnston <david.g.johnston@gmail.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: postgres-hape@gmx.de
Cc: pgsql-docs@lists.postgresql.org
Subject: Re: group by can use alias from select list
Date: Tue, 26 Sep 2023 17:31:30 -0400
Message-ID: <ZRNNssAV/470sBZD@momjian.us> (raw)
In-Reply-To: <ZPnZ9ILOZcWaqoY0@momjian.us>
References: <168871536004.379168.9352636188330923805@wrigleys.postgresql.org>
<25b70e6ec7bef81acac508dc61dfa01e72c96252.camel@cybertec.at>
<CAKFQuwYALfM-yamV7GCPG_WZvi_qK5O8rJPOGkD40ShDd9M_GQ@mail.gmail.com>
<ZPkQhuV8I6ijH+y3@momjian.us>
<1591985.1694044890@sss.pgh.pa.us>
<ZPnZ9ILOZcWaqoY0@momjian.us>
On Thu, Sep 7, 2023 at 10:11:00AM -0400, Bruce Momjian wrote:
> We do farther down the docs in the GROUP BY section:
>
> https://www.postgresql.org/docs/devel/sql-select.html
>
> GROUP BY will condense into a single row all selected rows that share
> the same values for the grouped expressions. An expression used inside a
> grouping_element can be an input column name, or the name or ordinal
> number of an output column (SELECT list item), or an arbitrary
> expression formed from input-column values. In case of ambiguity, a
> ------------------------
> GROUP BY name will be interpreted as an input-column name rather than an
> output column name.
>
> It says
>
> * input column name
> * output column name or ordinal number
> * expression formed from input-column values
>
> Is this too subtle?
Patch applied back to PG 11.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.
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To: pgsql-docs@postgresql.org
Cc: bruce@momjian.us, tgl@sss.pgh.pa.us, david.g.johnston@gmail.com, laurenz.albe@cybertec.at, postgres-hape@gmx.de, pgsql-docs@lists.postgresql.org
Subject: Re: group by can use alias from select list
In-Reply-To: <ZRNNssAV/470sBZD@momjian.us>
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