From: | Alberto Cabello Sánchez <alberto(at)unex(dot)es> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: unexpected (to me) sorting order |
Date: | 2015-04-08 09:56:16 |
Message-ID: | 20150408115616.0414b63cf88f430139c35187@unex.es |
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Lists: | pgsql-general |
On Wed, 08 Apr 2015 11:36:01 +0200
Chris Mair <chris(at)1006(dot)org> wrote:
> PostreSQL relies on the OS's C lib. So this kind
> of ordering problems depend on the OS' idea about
> collations.
>
> I don't know what's the rationale behin this,
> but it looks like Linux ignores the . when doing the sort.
Not only '.'. Sorting by VARCHAR is not ASCII order, but "alphabetical" (whatever
it means), which causes some behaviour to be more real-life oriented than
logically coherent, like this one:
select * from ejemplo order by texto;
id | texto
----+----------
2 | Lalin
1 | La Palma
3 | Lasarte
It is pretty obvious that ' ' is not between 'l' and 's', but this makes more
sense than
1 | La Palma
2 | Lalin
3 | Lasarte
--
Alberto Cabello Sánchez
<alberto(at)unex(dot)es>
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