Re: Problem with REFERENCES on INHERITS

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От David G Johnston
Тема Re: Problem with REFERENCES on INHERITS
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Msg-id 1422853892697-5836347.post@n5.nabble.com
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Ответ на Problem with REFERENCES on INHERITS  (William Gordon Rutherdale <will.rutherdale@utoronto.ca>)
Ответы Re: Problem with REFERENCES on INHERITS  (William Gordon Rutherdale <will.rutherdale@utoronto.ca>)
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William Gordon Rutherdale wrote
> I have encountered a problem with references when using INHERITS (on
> Postgres 9.1/9.2).  Could someone please explain why this occurs.
>
> My problem:  could someone please explain the semantics and why this
> behaviour makes sense -- or is it a design error or bug?
>
> To sum up the issue:
>     - I insert into the derived table (chimp) and get id 1
>     - I insert into the base table (primate) and get id 2
>     - I have a foreign key constraint in banana_stash to the
>       base table p.k. primate(id)
>     - inserting to banana_stash with reference to id 2 is okay
>     - inserting to banana_stash with reference 1 gives error
>     - both ids 1 and 2 in table primate are supposed to be valid
>
> So why does the one case give an error when the other does not?
>
> Also, is there a way to solve this problem (i.e. remove the error)
> without simply chopping out the REFERENCES clause from banana_stash?

I didn't read your post in depth but I suspect you have not read and
understood the limitations documented in section 5.8.1

http://www.postgresql.org/docs/9.1/interactive/ddl-inherit.html

David J.



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