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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Silvio Brandani <silvio.brandani@tech.sdb.it>
Cc: Albe Laurenz <laurenz.albe@wien.gv.at>
Cc: pgsql-admin@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: order by query wrong result
Date: Wed, 19 Nov 2014 11:10:26 -0500
Message-ID: <27275.1416413426@sss.pgh.pa.us> (raw)
In-Reply-To: <546CBDF1.2030007@tech.sdb.it>
References: <546CA188.705@tech.sdb.it>
	<A737B7A37273E048B164557ADEF4A58B17D9FF15@ntex2010a.host.magwien.gv.at>
	<546CBDF1.2030007@tech.sdb.it>
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Silvio Brandani <silvio.brandani@tech.sdb.it> writes:
> Hi,
>   lc_collate
> -------------
>   en_US.UTF-8

en_US (and, in fact, most Linux locales other than C) uses "dictionary
order", which ignores pretty much everything except letters in its
first-pass comparison.

You can check that it's not just Postgres being weird by feeding the
same data through sort(1) after setting LC_COLLATE this way in its
environment.  You'll get the same results.

			regards, tom lane


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