Re: Sorting Problem
От | Dennis Gearon |
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Тема | Re: Sorting Problem |
Дата | |
Msg-id | 3F3A75CC.5080007@cvc.net обсуждение исходный текст |
Ответ на | Re: Sorting Problem (Stephan Szabo <sszabo@megazone.bigpanda.com>) |
Ответы |
Re: Sorting Problem
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Список | pgsql-general |
If we really want to do it, we won't have to do the grunt work ourselves, just the tie-in, and Postgres specific implementation: http://www.unicode.org/reports/tr10/ Stephan Szabo wrote: > On Wed, 13 Aug 2003, Dennis Gearon wrote: > > >>Got a link to that section of the standard, or better yet, to a >>'interpreted' version of the standard? :-) > > > The standard draft yes, an interpreted version, unfortunately not (unless > Date's book covers it and I can find where my copy is. > > Here are some of the highlights > > ---- > k) form-of-use: A convention (or encoding) for representing > characters (in character strings). Some forms-of-use are > fixed-length codings and others are variable-length codings. > > l) form-of-use conversion: A method of converting character > strings from one form-of-use to another form-of-use. > > ---- > A character set is described by a character set descriptor. A > character set descriptor includes: > > - the name of the character set or character repertoire, > > - if the character set is a character repertoire, then the name of > the form-of-use, > > - an indication of what characters are in the character set, and > > - the name of the default collation of the character set. > > For every character set, there is at least one collation. A > collation is described by a collation descriptor. A collation descriptor > includes: > > - the name of the collation, > > - the name of the character set on which the collation operates, > > - whether the collation has the NO PAD or the PAD SPACE attribute, > and > > - an indication of how the collation is performed. > > --- > > The character data types and literals can include a character set > definition. Character type columns can include a collation. There's a > COLLATE <blah> clause that looks like it can be used in expressions as > well. > >
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