Re: Storing data and code in a Db with LISP-like interface

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Fri, 28 Apr 2006 14:11:10 GMT
Message-ID: <2op4g.67573$VV4.1291818_at_ursa-nb00s0.nbnet.nb.ca>

x wrote:

> "Bob Badour" <bbadour_at_pei.sympatico.ca> wrote in message
> news:mub2g.63837$VV4.1194075_at_ursa-nb00s0.nbnet.nb.ca...
> 

>>JOG wrote:
>>
>>
>>>Bob Badour wrote:
>>>
>>>
>>>>JOG wrote:
>>>>
>>>>
>>>>
>>>>>Bob Badour wrote:
>>>>>
>>>>>
>>>>>
>>>>>>JOG wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Bob Badour wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Alvin Ryder wrote:

> 
> 


>>>>The point is the relational model basically supports both with the one

>>>>small requirement that one must specify one's universe. I do not

>>>>understand what you mean by 'has to remember this predicate'.

>>>

>>>I don't agree, but we may be talking at cross purposes - let me explain

>>>with a trivial example. Take the relation: { (clothing:coat,

>>>weather:sunny), (clothing:sunglasses, weather:raining) }

>>>

>>>I am storing propositions of the nature that if Frank, say, is not

>>>wearing a coat it is sunny, and if he's is not wearing sunglasses then

>>>it must be raining (Frank's a bit of a fashion victim). The predicate

>>>behind the relation is: [¬clothing -> weather], and anyone interacting

>>>with the db must be aware of this in order to reform my original

>>>propositions, and so draw appropriate conclusions.

>>>

>>>In prolog, however I can state this explicitly and another user will

>>>not require any external knowledge of the relationship:

>>>

>>>weather(sunny) :- /+ clothing(coat)

>>>weather(rainy) :- /+ clothing(sunglasses)

>>>
>>>And there my limited knowledge of logical programming is exhausted.

> 

>>Okay, I think I see what you mean. Thank you for explaining it to me.

> 
> What about constraints ?
> What about derived relations ?
> What about count() ?
> What about normalization ?
> What about bussiness rules ?
> What about data mining ?

What about them? Do they apply to programming languages? Keep in mind the post I responded to was cross-posted to five newsgroups with only two purporting to address data management.

I asked someone to clarify a point about a programming language, and he did. Received on Fri Apr 28 2006 - 16:11:10 CEST