"tjk(at)tksoft(dot)com" <tjk(at)tksoft(dot)com> writes:
> If upper() and lower() operate on characters in 8859-1 and other character
> sets when the appropriate locale is set, then a difference in the behavior
> of upper() and lower() would seem like a bug.
Au contraire ... upper() and lower() are not symmetric operations in
quite a few non-English locales. I'll let those who regularly work with
them give specific details, but handling of accents, German esstet (sp?),
etc are the gotchas that I recall.
regards, tom lane