Re: Why spurious tuples with fifth normal form?

From: Jan Hidders <>
Date: Thu, 16 Jun 2005 19:13:39 GMT
Message-ID: <Dbkse.122681$> wrote:
> Out of curiousity, I have seen data sets where
> there is a join dependency due to a cyclic constraint, but I'm not sure
> what exactly constitutes a cyclic constraint. I thought my dataset had
> one, but apparently not. How does one go about determining a cyclic
> constraint?

Do you want to know how to recognize if a certain join dependency holds, or do you want to know how to check if a certain JD that you found is cyclic? But first, perhaps, is it precisly clear to you what a JD is?

  • Jan Hidders
Received on Thu Jun 16 2005 - 21:13:39 CEST

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