David E. Wheeler napsal(a):
On Jun 3, 2008, at 02:27, Zdenek Kotala wrote:
The proposal of GSoc is there:
http://archives.postgresql.org/pgsql-hackers/2008-05/msg00857.php
It should create basic framework for full SQL COLLATION support. All
comments are welcome.
That looks great, Zdenek. I'm very excited to have improved SQL
COLLATION support in core. But if I could ask a dumb question, how would
I specify a case-insensitive collation? Or maybe the Unicode Collation
Algorithm is case-insensitive or has case-insensitive support?
It is simple. SQL standard does not specify notation for that (chapter 11.34).
But there is proposed notation:
CREATE COLLATION <collation name> FOR <character set specification> FROM
<existing collation name> [ <pad characteristic> ] [ <case sensitive> ] [
<accent sensitive> ] [ LC_COLLATE <lc_collate> ] [ LC_CTYPE <lc_ctype> ]
<pad characteristic> := NO PAD | PAD SPACE
<case sensitive> := CASE SENSITIVE | CASE INSENSITIVE
<accent sensitive> := ACCENT SENSITIVE | ACCENT INSENSITIVE
You can specify for each collation if it is case sensitive or not and collation
function should be responsible to correctly handle this flag.
Zdenek
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