Notes and questions below. (01)
On Tue, Jan 6, 2015 at 4:19 PM, Matthew West <dr.matthew.west@xxxxxxxxx> wrote:
> Dear David,
> You use categories, logic and rules in databases too. What is the type of
> sale? What is the maximum credit a client is allowed? (02)
This is a good point. (03)
Do you feel that the ability to categorize particular data in a
database is supported
by the database infrastructure or must be provided by external procedures or
data ? (04)
When I speak of category support, I'm thinking of being able to define
some data as an instance of a particular category, and then possibly a
hierarchy of categories as sub-collections of other categories, and be
able to find all the data that can be categorized by any particular
category without replicating the entire hierarchy in the query. (05)
Maybe you could do that by having a fixed height of the category
hierarchy, requiring the hiearchy to be rooted, and storing the path
to the root from the current instance in a block of columns, treating
the path as a series. I suggest this because I don't know how much
support SQL has for a column that has a variable number of
sub-parts/sub-columns. (06)
I know that SQL allows some logic (such as in the WHERE clause), but was not
aware that you could store negative information in the database, such as the
suit color was NOT Red, and NOT Plaid. I think of a database as solely storing
positive information (much as Propositional Logic system might support) (07)
I didn't know SQL supported modal information such as what is "allowed
for a client". (08)
>
> A knowledge base does not need to be a collection of singletons, and
> generally is not. I expect a knowledge base to have a lot of classification
> and whole-part relationships, but you might think of them more in relation
> to what the whole-part relations were between rather than as a separate
> collection with the same structure relating different things. It is just
> that with a knowledge base you do not need to think about these things
> before you start, with a database you do. (09)
I can see how the definition of a knowledge base would need to mention this
dynamic nature of structuring. (010)
>
> Regards
>
> Matthew West
> Information Junction
> Mobile: +44 750 3385279
> Skype: dr.matthew.west
> matthew.west@xxxxxxxxxxxxxxxxxxxxxxxxx
> http://www.informationjunction.co.uk/
> https://www.matthew-west.org.uk/
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>
>
> -----Original Message-----
> From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
> [mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of David Whitten
> Sent: 06 January 2015 19:36
> To: [ontolog-forum]
> Subject: Re: [ontolog-forum] knowledge base and DBs
>
> Thank you Matt,
>
> This is an intriguing idea to me, that the number of individuals that have a
> particular structure is the defining characteristic of when to use a
> database or a knowledge base.
>
> Do you think that because a knowledge base is mostly a collection of
> singletons, that effectively using a knowledge base predisposes one to want
> to use logic, rules, and categories to describe it?
>
> David Whitten
> 713-870-3834
>
>
> On Tue, Jan 6, 2015 at 2:00 PM, Matthew West <dr.matthew.west@xxxxxxxxx>
> wrote:
>> Dear David and Alexander,
>> Hmmm. Well to my mind the biggest difference is not to do with
>> operations and logic, SQL is very competent. The key difference is
>> that a database has a structure that is defined at database definition
>> time, and data that is added at runtime. On the other hand, a
>> knowledge base has minimal structure, and is defined by the type of
>> knowledge base used. None of this has much to do with what you can do
>> with the different approaches, and a lot of things you can do with
>> either. A database is likely to be more efficient when there are a lot
>> of records with the same structure to be stored and referred to. A
>> knowledgebase is likely to be more efficient when flexibility in structure
> is what is required.
>>
>> Regards
>>
>> Matthew West
>> Information Junction
>> Mobile: +44 750 3385279
>> Skype: dr.matthew.west
>> matthew.west@xxxxxxxxxxxxxxxxxxxxxxxxx
>> http://www.informationjunction.co.uk/
>> https://www.matthew-west.org.uk/
>> This email originates from Information Junction Ltd. Registered in
>> England and Wales No. 6632177.
>> Registered office: 8 Ennismore Close, Letchworth Garden City,
>> Hertfordshire,
>> SG6 2SU.
>>
>>
>>
>> -----Original Message-----
>> From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
>> [mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of David
>> Whitten
>> Sent: 06 January 2015 17:07
>> To: [ontolog-forum]
>> Subject: Re: [ontolog-forum] knowledge base and DBs
>>
>> In my mind, one of the big differences between a database (db) and a
>> knowledge base (kb):
>>
>> a databases store information, and may actually include calculated
>> information that is dependent on the stored information. Basically, a
>> storage facility for known facts.
>>
>> a knowledge base includes all that is in a database but also includes
>> the activity of inference from information, and has a far more
>> sophisticated model of hierarchical categories of information. A
>> knowledge base also includes all the standard First Order Predicate
>> Calculus operations: AND OR NOT FORALL THEREEXISTS as well. Knowledge
>> bases handle infinite groups of facts as it were.
>>
>> Does anyone have something to add to this?
>>
>> Dave Whitten
>> 713-870-3834
>>
>>
>> On Tue, Jan 6, 2015 at 11:33 AM, Alexander Garcia Castro
>> <alexgarciac@xxxxxxxxx> wrote:
>>> Hi all, I am having some troubles explaining the difference between a
>>> DB and a knowledge base, can someone let me know the difference?
>>>
>>> --
>>> Alexander Garcia
>>> http://www.alexandergarcia.name/
>>> http://www.usefilm.com/photographer/75943.html
>>> http://www.linkedin.com/in/alexgarciac
>>>
>>>
>>>
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