Niels Jespersen <n...@dst.dk> writes:
> According to https://www.postgresql.org/docs/current/sql-syntax-lexical.html,
> "Key words and unquoted identifiers are case insensitive." And "SQL
> identifiers and key words must begin with a letter (a-z, but also letters
> with diacritical marks and non-Latin letters) or an underscore (_).
> Subsequent characters in an identifier or key word can be letters,
> underscores, digits (0-9), or dollar signs ($)."
> So far so good. Non-latin letters are included, which I take to also include
> the danish letters æøå/ÆØÅ.
> However, name-folding is odd for these letters. Of these three create tables,
> the two first succeed, the last one does not (G and g is equivalent, Æ and æ
> is not).
Whether non-ASCII characters get downcased is very context dependent.
You've not mentioned the database encoding or the locale (LC_CTYPE)
setting, but both of those are relevant. Basically, in a single-byte
encoding we'll apply tolower() to identifier characters; but we don't
attempt to case-fold multi-byte characters at all. This logic is pretty
hoary, dating from before Unicode became widespread, but I'd be hesitant
to change it now.
regards, tom lane
