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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
Message-ID: 490AD761.EE98.0025.0@wicourts.gov (view raw or flat)
Thread:
Lists: pgsql-hackers
>>> 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
or 
> constraints and they do not allow implicit casting to their base
type. 
> The latter aspect is what makes them distinct types.  They are useful
to 
> create more type-safe database schemas, to prevent using generic
types 
> such as text or int for everything and then mixing them in
inappropriate 
> 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?
 
-Kevin

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