> 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.
GPG key ID: E583D7D2
In response to
pgsql-hackers by date
|Next:||From: Josh Berkus||Date: 2008-06-03 22:36:02|
|Subject: Re: proposal: Preference SQL|
|Previous:||From: Simon Riggs||Date: 2008-06-03 22:04:13|
|Subject: Re: Change lock requirements for adding a trigger|