# jg@xxxxxxxx / 2005-01-25 10:40:15 +0100:
> I add use in my time in University some software that use "extended
> type".
> For each variable, we define the mandatory "classic type" as integer,
> float, double array of.
> And we define an optional "extended type" as the unit in the MKSA
> system (Meter, Kilogram, Second, Ampere) or any other unit we would
> have previously define (eg. Currency).
>
> This "extended type" was wonderful, because there was warning/error if
> "extend type" does not match in any computation: you can not add apple
> to orange.
>
> I would appreciate to have such system in PostgreSQL.
Is CREATE TYPE what you're looking for?
http://www.postgresql.org/docs/8.0/static/sql-createtype.html
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