Re: Domains (Was [PERFORM] Views With Unions)

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От Francisco J Reyes
Тема Re: Domains (Was [PERFORM] Views With Unions)
Дата
Msg-id 20030802142257.S99004@zoraida.natserv.net
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Ответ на Re: Domains (Was [PERFORM] Views With Unions)  (Jochem van Dieten <jochemd@oli.tudelft.nl>)
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On Sat, 2 Aug 2003, Jochem van Dieten wrote:

> Francisco J Reyes wrote:
> > Are domains user defined types? That they seem to be based on what I see
> > on the docs.
>
> They are similar a bit to user defined types,
......
>
> Please note that the SQL:1999 concept of user defined types is
> quite different from the one in PostgreSQL (in his book "Advanced
> SQL:1999" Jim Melton even warns that domains may be deprecated in
> future SQL standards in favour of SQL-style user defined types).


Thanks for the explanation and the warning. Based on your feedback, don't
quite see how domains would be usefull to me so I will not use them for
now.

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