From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
---|---|
To: | David Fetter <david(at)fetter(dot)org>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: set-level update fails with unique constraint violation |
Date: | 2010-01-02 18:23:24 |
Message-ID: | dcc563d11001021023p2cdd0ba2kdbfbb74999a3e8b4@mail.gmail.com |
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Lists: | pgsql-general |
On Sat, Jan 2, 2010 at 1:40 AM, Roman Neuhauser <neuhauser(at)sigpipe(dot)cz> wrote:
> # david(at)fetter(dot)org / 2009-12-31 08:04:58 -0800:
>> On Thu, Dec 31, 2009 at 10:52:20AM +0100, neuhauser+pgsql-general#postgresql(dot)org(at)sigpipe(dot)cz wrote:
>> > Hello,
>> >
>> > this fails with "duplicate key value":
>> >
>> > CREATE TABLE x (
>> > i INT NOT NULL UNIQUE
>> > );
>> > INSERT INTO x (i) VALUES (1), (2), (3);
>> > UPDATE x SET i = i + 1;
>> >
>> > are there any plans to make this work?
>>
>> This will work in 8.5:
>>
>> CREATE TABLE x (
>> i int NOT NULL UNIQUE DEFERRABLE INITIALLY DEFERRED
>> );
>> INSERT INTO x (i) VALUES (1), (2), (3);
>> UPDATE x SET i = i + 1;
>
> thanks, this might be a bearable workaround in some cases
> provided there's also SET CONSTRAINTS ... DEFERRED / IMMEDIATE.
> what I really want is a mode that fires the constraint check
> at the end of the statement.
What advantage would there be to a constraint that fires right after
to one that fires at the end of the transaction?
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