The following bug has been logged online:

Bug reference: 2300
Logged by: Kashin Oleg
Email address: kashin.oleg (AT) mail (DOT) ru
PostgreSQL version: 8.1
Operating system: Suse 9.1
Description: Error in upper function
Details:

My database is with UTF8 encoding. When I use function "upper" for any filed
of table I get the next error
"Invalid multibyte character for locale".
Example:
select from users where upper(user_login) like '%';
I rewrote such SQL query like next one -
select from users where lower(user_login) like '%'; and everything now is
ok.
Thanks.

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Kashin Oleg wrote:

Did you select a locale appropiate for UTF8 as well? It's pretty easy
to get into trouble if you select a non-matching pair of locale and
encoding. UTF8 locales are usually prefixed with ".UTF8", so for
example in my case es_CL.UTF8 works with UTF8 encoding, but es_CL
doesn't, as the latter assumes iso-8859-1 encoding.

--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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