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Home -> Community -> Usenet -> comp.databases.theory -> Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

From: VC <boston103_at_hotmail.com>
Date: Thu, 16 Jun 2005 07:31:22 -0400
Message-ID: <lPOdnTWcOPmb_izfRVn-ig@comcast.com>

"Alexandr Savinov" <savinov_at_host.com> wrote in message news:42b14ba3$1_at_news.fhg.de...
> Jon Heggland schrieb:

[....]

>>>I understand your question: So what is the problem, we simply write
>>>queries and database engine executes them. Correct. But what if I do not
>>>want to write numerous queries? I want my database do it for me. I define
>>>only my data and then ask questions and that is all.
[.....]
>
> Yes, we need to add more information into our model so that the database
> knows what to do if queries do not have enough information. In other
> words, the model has more information while queries are simpler.
>

Please explain what exactly you mean by the expression "the database knows what to do if the queries do not have enough information". 'Knows' in what sense ? As an AI specimen or in some other sense ? Also please give some specific examples of those queries illustrating your statement.

>>>RM is too low level mnodel and in this sense we are able to implement
>>>almost everything. The main problem is that the database itself (the
>>>model itself) is unaware of what we are doing, what we are implementing,
>>>what our data means, what is the purpose of some query.

In what specific way do you propose the database should be aware of "what we are doing" ?

> [...] Semantics can be defined as both constraints with data or only data.

No, it cannot. In your private vocabulary maybe.

> function applied to a set. It is more general - strictly speaking we can
> aggregate (project) everything and deproject everything.

What's 'project' and 'deproject' supposed to mean ?

Also, you still did not answer how the notion of 'singularity' and 'delta-function' is related to nulls. Eagerly awaiting.

vc
>
> --
> alex
> http://conceptoriented.com
Received on Thu Jun 16 2005 - 06:31:22 CDT

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