Re: circular relationships ok?

From: Gene Wirchenko <genew_at_ucantrade.com.NOTHERE>
Date: Thu, 02 Mar 2006 15:22:12 -0800
Message-ID: <6fve02p81irjbqrf4b4h6gpkaof8160213@4ax.com>

On 2 Mar 2006 14:23:49 -0800, "Marshall Spight" <marshall.spight_at_gmail.com> wrote:

>David Portas wrote:
>>
>> For example, suppose I want to implement a constraint that each Order
>> must have exactly one Invoice and each Invoice must have exactly one
>> Order. That seems like a reasonable business rule, even if it's a
>> slightly unusual one.
>
>If that is the business rule, then are not Invoices and Orders
>the same entity?

No. (Trying substituting "husband" for "order" and "wife" for "invoice".)

Sincerely,

Gene Wirchenko Received on Thu Mar 02 2006 - 17:22:12 CST