| From: | Jan Urbański <j(dot)urbanski(at)students(dot)mimuw(dot)edu(dot)pl> |
|---|---|
| To: | "Decibel!" <decibel(at)decibel(dot)org> |
| Cc: | Postgres - Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: proposal: Preference SQL |
| Date: | 2008-06-03 22:24:59 |
| Message-ID: | 4845C4BB.50608@students.mimuw.edu.pl |
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| Lists: | pgsql-hackers |
Decibel! wrote:
> On May 29, 2008, at 6:08 PM, Jan Urbański wrote:
>> Preference SQL is an extension to regular SQL, that allows expressing
>> preferences in SQL queries. Preferences are like "soft" WHERE clauses.
> This seems like a subset of http://pgfoundry.org/projects/qbe/ ... or do
> I misunderstand?
I skimmed through the QBE howto, and I think it's actually far from it.
The thing that closely resembles preference clauses is the SKYLINE OF
operator, mentioned eariler in the thread - there is some archives
coverage on it.
I'm still working on producing a comparision of preference SQL and the
skyline operator, more to follow soon.
--
Jan Urbanski
GPG key ID: E583D7D2
ouden estin
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