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Re: Why no 1to1 relationships?

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Re: Why no 1to1 relationships?

Subject: Re: Why no 1to1 relationships?
From: Sacha Michel Mallais <email@hidden>
Date: Wed, 2 Apr 2008 12:52:51 -0700

On Apr 2, 2008, at 12:02 PM, Art Isbell wrote:

I think that this agrees with relational database theory; i.e., all one-to-one relationships must be 1:1, not 1:0. A 1:0 relationship is just a special case of a 1:many relationship.

It is definitely possible to have an optional to-one, just not one where the FK is also the PK.


sacha


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Sacha Michel Mallais             Senior Developer / President
Global Village Consulting Inc.   http://www.global-village.net/
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ObAd: read "Practical WebObjects" <fnord>
http://www.global-village.net/products/practical_webobjects


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Follow-Ups:

Re: Why no 1to1 relationships?
From: Art Isbell <email@hidden>


References:  
  >Why no 1to1 relationships? (From: Jeff Schmitz <email@hidden>)
  >Re: Why no 1to1 relationships? (From: Jacky Gagnon <email@hidden>)
  >Re: Why no 1to1 relationships? (From: Robert Walker <email@hidden>)
  >Re: Why no 1to1 relationships? (From: Art Isbell <email@hidden>)




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