Re: Uppercase version of ß desired

Hmmm. Yes the unicode rules seem to be a little strict on conforming to
the past! I just made the following fix to my python code in forming the
upper case alphabet from the lower case one:

uc_alphabet = lc_alphabet.replace('ß', 'ẞ').upper()

So far I have only found German to have a lower case letter which has the
same value for its upper cased one.

Thanks,
Celia McInnis

.

On Mon, Mar 13, 2023 at 6:54 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> "Peter J. Holzer" <hjp-pgsql(at)hjp(dot)at> writes:
> > On 2023-03-13 17:38:51 -0400, Celia McInnis wrote:
> >> I would be really happy if postgresql had an upper case version of the ß
> >> german character.
>
> > But the 'ß' is a bit special as it is usually uppercased to 'SS'
> > (although 'ẞ' is now officially allowed, too).
> > Apparently your (and my) locale doesn't uppercase ß at all, which isn't
> > correct according to German spelling rules but was very common in the
> > last decades.
>
> Our code for libc locales doesn't support upcasing 'ß' to 'SS',
> because it uses towlower() which can only manage
> one-character-to-one-character transformations. It should work for
> upcasing to 'ẞ', but as you say, you need to find a locale that thinks
> that should happen.
>
> You might have better luck if you have a version of Postgres that
> supports ICU and you can use an ICU locale. That code path doesn't
> appear to have any hard-wired assumption about how many characters
> in convert to how many out.
>
> regards, tom lane
>