Re: ALTER TABLE ... REPLACE WITH

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От Simon Riggs
Тема Re: ALTER TABLE ... REPLACE WITH
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Msg-id 1292428213.1193.242.camel@ebony
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Ответ на Re: ALTER TABLE ... REPLACE WITH  (Csaba Nagy <ncslists@googlemail.com>)
Ответы Re: ALTER TABLE ... REPLACE WITH  (Robert Haas <robertmhaas@gmail.com>)
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On Wed, 2010-12-15 at 12:17 +0100, Csaba Nagy wrote:

> But one problem would be when the replaced table is the _parent_ for a
> foreign key relationship. I don't think you can have that constraint
> pre-verified on the replacement table and simply replacing the content
> could leave the child relations with orphans. 

Good point.

The only sensible way to handle this is by putting the FK checks into
check pending state (as discussed on a different thread).

We would probably need to disallow FKs with DELETE or UPDATE CASCADE
since it would be difficult to execute those.

-- Simon Riggs           http://www.2ndQuadrant.com/books/PostgreSQL Development, 24x7 Support, Training and Services



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