Re: Exclusion Constraints on Arrays?

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От
David E. Wheeler
Тема
Re: Exclusion Constraints on Arrays?
Дата
в 14:38:57
Msg-id
53A5174B-13D6-411B-9F5A-1EEF312D2EE2@justatheory.com
Ответ на
Re: Exclusion Constraints on Arrays? (Robert Haas)
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Дерево обсуждения
Exclusion Constraints on Arrays? "David E. Wheeler" <david@justatheory.com>
Re: Exclusion Constraints on Arrays? Robert Haas <robertmhaas@gmail.com>
Re: Exclusion Constraints on Arrays? "David E. Wheeler" <david@justatheory.com>
Re: Exclusion Constraints on Arrays? Robert Haas <robertmhaas@gmail.com>
Re: Exclusion Constraints on Arrays? Tom Lane <tgl@sss.pgh.pa.us>
Re: Exclusion Constraints on Arrays? "David E. Wheeler" <david@justatheory.com>
Re: Exclusion Constraints on Arrays? Peter Geoghegan <peter@2ndquadrant.com>
Re: Exclusion Constraints on Arrays? Robert Haas <robertmhaas@gmail.com>
Re: Exclusion Constraints on Arrays? "David E. Wheeler" <david@justatheory.com> 
On May 23, 2012, at 10:35 AM, Robert Haas wrote:

>> "Exclusion constraints generalize uniqueness constraints by allowing
>> arbitrary comparison operators, not just equality....This is useful
>> for time periods and other ranges, as well as arrays."
> 
> I objected to it at the time, but lost the argument.

It does rather seem to be a mistake to say that they can be used with arrays when they cannot. Or can they in some other way I haven’t noticed?

David
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