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Re: predicate, constraints, header, relvar, and relation

From: <davis.jeffrey_at_gmail.com>
Date: 21 Apr 2007 12:31:21 -0700
Message-ID: <1177183881.429682.249150@o5g2000hsb.googlegroups.com>


On Apr 20, 5:26 pm, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:
> Both. The data types of the attributes are part of the predicates of
> both the variable and the value. Generally speaking, the most specific
> type of any attribute of the value will be a subtype of the declared
> type of the variable.

Thanks. This makes it much more clear.

> It certainly makes sense to draw attention to the important properties
> of a literal in a given context. I could see someone wanting to overload
> the constraint concept to achieve this goal, but I think that would be a
> mistake.
>

Ok, I see.

Thanks for the insightful reply! Received on Sat Apr 21 2007 - 14:31:21 CDT

Original text of this message

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