Deferrable constraints
Are there any plans to implement deferrable unique constraints?
I have two identical tables a1 and a2. Each of them has a primary key
'id' and unique constraint on 'prod' and 'code'.
Now, imagine the following situation:
a1:
id prod code
1 1 abc1
2 1 abc2
a2:
id prod code
1 1 abc2
2 1 abc1
Basically, a1 and a2 have code values swapped.
Now, I want to update 'code' values in table a1 with values from table
a2 relying on equal 'id' values. This throws a 'can not insert duplicate
value' exception.
Is there a way to deal with this situation? I would prefer not to update
'id' values based on 'prod' and 'code' values though.
Thanks.
Oleg
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On Tue, Jun 17, 2003 at 11:20:15 -0600,
Oleg Lebedev <oleg.lebedev@waterford.org> wrote:
Are there any plans to implement deferrable unique constraints?
It is on the TODO list (http://developer.postgresql.org/todo.php):
* Allow DEFERRABLE UNIQUE constraints
Hmm,
I really need to disable that unqiue constraint temporarily during the
table update. I tried to mess with pg_constraint and pg_index, but
didn't figure out how to do this.
Any ideas from system schema buffs?
Thanks.
Oleg
-----Original Message-----
From: Bruno Wolff III [mailto:bruno@wolff.to]
Sent: Tuesday, June 17, 2003 11:37 AM
To: Oleg Lebedev
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Deferrable constraints
On Tue, Jun 17, 2003 at 11:20:15 -0600,
Oleg Lebedev <oleg.lebedev@waterford.org> wrote:
Are there any plans to implement deferrable unique constraints?
It is on the TODO list (http://developer.postgresql.org/todo.php):
* Allow DEFERRABLE UNIQUE constraints
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