"Kevin Grittner" <kevin.gritt...@wicourts.gov> writes:
> Another long-range nicety would be something which I have seen in
> some other databases, and which is consistent with the inheritance
> theme, is that you can't compare or assign dissimilar domains -- an
> error is thrown. So if you try to join from the eye color column in
> a person table to the key of a hair color table, you get an error
> unless you explicitly cast one or both of them to the common type.
[ raised eyebrow ... ] This is all pretty cute, but I think it goes
against both the letter and spirit of the SQL standard. What you
are describing might be a useful thing to have, but it isn't a SQL
domain.
regards, tom lane
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