Re: pg_class and enum types

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От Tom Lane
Тема Re: pg_class and enum types
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Msg-id 11565.1243200585@sss.pgh.pa.us
обсуждение исходный текст
Ответ на Re: pg_class and enum types  (Andrew Dunstan <andrew@dunslane.net>)
Ответы Re: pg_class and enum types  (Gevik Babakhani <pgdev@xs4all.nl>)
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Andrew Dunstan <andrew@dunslane.net> writes:
> Gevik Babakhani wrote:
>> select * from pg_class where relname='test_type'

> It's not so much that enum types are handled specially, but that 
> composite types are. :-)

Relations (tables) have always had both pg_class and pg_type entries.
The pg_class entry denotes the relation proper, the pg_type entry
denotes the relation's rowtype.

Composite types have the same two entries, there's just a different
notion of which one is primary.

(The reason a composite type has to have a pg_class entry is that
it has pg_attribute entries, and those have to have something in
pg_class for their attrelid to link to.)
        regards, tom lane


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