On Saturday 17 February 2007 09:26, Tom Lane wrote:
> "Overlapping" is not an equality relation (it fails the transitive law),
> so I'm not entirely sure what "unique" means in this context ... but I
> can promise you you can't make it work with btree.

There is an equality relation on periods. But it wouldn't really tell you much 
useful info, as it's not normally what you're looking for with time.

Warren Turkal (w00t)

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