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From: David Johnston <polobo@yahoo.com>
To: pgsql-general@postgresql.org
Subject: Re: problem with query
Date: Thu, 12 Sep 2013 15:57:34 -0700 (PDT)
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Roberto Scattini wrote
> what makes the 'ñ' char special that makes the queries the same when it is
> not there?

My knowledge here is a little rough around the edges but the following is
conceptually true:

For the most part legacy encodings (or non-encodings as this case
technically falls under) recognize only the explicit case-conversions for
the latin alphabet A-Z (mapped onto "a-z") without any accents.

To reasonably process strings/varchars/clobs that contain accented letters
it is necessary to use a more modern encoding - such as UTF-8/Unicode -
which contains the necessary logic to perform the additional conversions.

these should (not going to test it myself at this time) by
case-insensitively identical:

abcdëFGH
ABCDëfgh

since the "a-d, f-h" can be converted between and the one symbol that
cannot, "ë" is the same in both string....so it isn't that the ë breaks
things but rather that symbol has no upper-case alternative to equivalently
match against...just like numbers and symbols behave in the same situation. 
To ASCII ë is just a symbol without any "letter of alphabet"
characteristics.

David J.
 



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