| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | Erik Thiele <erik(at)thiele-hydraulik(dot)de> |
| Cc: | pgsql-sql(at)postgresql(dot)org, pgsql-docs(at)postgresql(dot)org |
| Subject: | Re: [SQL] special integrity constraints |
| Date: | 2004-03-23 00:34:56 |
| Message-ID: | 20040323003456.GA7733@wolff.to |
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| Thread: | |
| Lists: | pgsql-docs pgsql-sql |
On Mon, Mar 22, 2004 at 17:21:21 +0100,
Erik Thiele <erik(at)thiele-hydraulik(dot)de> wrote:
>
> there is no such thing as a deferred check constraint:
>
> DEFERRABLE
> NOT DEFERRABLE
>
> This controls whether the constraint can be deferred. A constraint that
> is not deferrable will be checked immediately after every command.
> Checking of constraints that are deferrable may be postponed until the
> end of the transaction (using the SET CONSTRAINTS command). NOT
> DEFERRABLE is the default.
>
> !!! Only foreign key constraints currently accept
> this clause. All other constraint types are not deferrable. !!!
Sorry, I checked the syntax for CREATE TABLE in the documentation and
it shows DEFERRABLE as allowed on any column constraint. However, that
is apparently not correct.
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