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From: Lennart Jonsson <erik.lennart.jonsson@gmail.com>
Newsgroups: comp.databases.ms-sqlserver
Subject: Re: A question about relationship
Date: Tue, 11 Feb 2014 18:01:28 +0100
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On 02/11/2014 04:11 PM, Ross Presser wrote:
[...]
> And it can be seen from the scripts that each Order must relate 
> to one Customer. See the section I have marked out with hyphens:
> 

CustomerId can be null, and therefore an order must not relate to one
Customer.


Cheers
/Lennart