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From: Bruno Wolff III <[email protected]>
To: Erik Thiele <[email protected]>
Cc: [email protected]
Subject: Re: special integrity constraints
Date: Mon, 22 Mar 2004 09:12:11 -0600
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

On Mon, Mar 22, 2004 at 14:10:42 +0100,
  Erik Thiele <[email protected]> wrote:
> 
> it means (((count_rows(a)+count_rows(b)) modulo 2) == 0)

OK, that means my FK suggestion won't help. The other suggestion about
putting triggers on "a" and "b" to update a count in another table
that has a deferred check constraint on it may be your best bet.
This will be a source of contention, but that may or may not be all
that important depending on how often you are updating "a" and "b".

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