Re: underscore pattern in a query doens't work

"Sergio Calero." <angusyoung4@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 'Garaf�a' ]

I suspect what you have here is an encoding problem.  That is, probably
the "�" 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You do realize this is about 3 years out of date?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