Re: Distinct types

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "PG Hackers" <pgsql-hackers(at)postgresql(dot)org>, "Peter Eisentraut" <Peter(dot)Eisentraut(at)Sun(dot)COM>
Subject: Re: Distinct types
Date: 2008-10-31 15:01:05
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>>> Peter Eisentraut <Peter(dot)Eisentraut(at)Sun(dot)COM> wrote:
> Here is an implementation of distinct types, known from SQL99 and
> beyond. They are like domains, except that they don't have defaults
> constraints and they do not allow implicit casting to their base
> The latter aspect is what makes them distinct types. They are useful
> create more type-safe database schemas, to prevent using generic
> such as text or int for everything and then mixing them in
> ways.

I expect I'll be using this. Thanks!

I notice there's no documentation yet. Do you have a reference to a
good description of the feature, consistent with your implementation?

If not, a couple questions:

(1) Can you compare a literal of the base type?

(2) Can you explicitly cast to the base type?


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