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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