Thanks Tom, for your suggestions.
We started the cluster up with this command:
./initdb -D /usr/local/postgre/data -E UTF8 -U sir

The rest of the variables related to encoding (locale) are:
lc_collate=C 
lc_ctype=C
lc_messages=C
lc_monetary=C
lc_numeric=C
lc_time=C

Could you tell me which more info could I give you?


________________________________
 De: Tom Lane <t...@sss.pgh.pa.us>
Para: Sergio Calero. <angusyou...@yahoo.es> 
CC: "pgsql-sql@postgresql.org" <pgsql-sql@postgresql.org> 
Enviado: Jueves 13 de septiembre de 2012 16:19
Asunto: Re: [SQL] underscore pattern in a query doens't work
 
"Sergio Calero." <angusyou...@yahoo.es> writes:
> I'd like to execute a query using the underscore as a pattern.
> select id,etiqueta from limites_municipales where etiqueta like 'Garaf_a';
> [ but this fails to match 'Garafía' ]

I suspect what you have here is an encoding problem.  That is, probably
the "í" is represented as a multi-byte character (most likely UTF8)
but the server thinks it's working with a single-byte encoding so that
any one character should be only one byte.

You didn't say what your encoding setup is, so it's hard to do more
than speculate.

> PostgreSQL 8.4.1 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 3.4.6 
> 20060404 (Red Hat 3.4.6-10), 64-bit

You do realize this is about 3 years out of date?  The 8.4 series is up
to release 8.4.13, and a lot of those updates contained fixes for
serious bugs.

            regards, tom lane


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