Re: A question for Mr. Celko
From: Jan Hidders <jan.hidders_at_REMOVETHIS.pandora.be>
Date: Mon, 19 Jul 2004 09:46:26 GMT
Message-ID: <pan.2004.07.19.09.47.05.758730_at_REMOVETHIS.pandora.be>
Date: Mon, 19 Jul 2004 09:46:26 GMT
Message-ID: <pan.2004.07.19.09.47.05.758730_at_REMOVETHIS.pandora.be>
On Mon, 19 Jul 2004 02:41:36 +0000, Marshall Spight wrote:
>
> In light of this view, I don't see anything in Date's interpretation
> of 1NF that means that values aren't atomic anymore. On the
> other hand, I could imagine you describing this interpretation
> of "atomic" as trivializing the concept of atomicity as well,
> which it kind of is.
No no, that's not the problem, or at least not what I think is the problem. Date allows the NEST and UNNEST operations from the nested relational algebra. (He calls them GROUP and UNGROUP for some reason.) That means that you no longer consider them atomic because they allow you to split a nested relation into its constituent parts.
- Jan Hidders