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uniqueness constraint on an a foreign key

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uniqueness constraint on an a foreign key

Subject: uniqueness constraint on an a foreign key
From: Florijan Stamenkovic <email@hidden>
Date: Fri, 19 Sep 2008 13:00:50 -0400

Hi all,

I have a relationship A <->> B. B carries the FK for A, not allowed to be null.

I'd like to enforce that a single A can relate to only one B so I'm thinking of putting a uniqueness constraint on the FK. As far as I can see that will give me what I want without causing any trouble. Can anyone think of a reason against doing this, or is there a better practice to address this?

Thanks,
F
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