Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: At what ANSI/SPARC level are you, when creating new... totally lost

Re: At what ANSI/SPARC level are you, when creating new... totally lost

From: paul c <toledobythesea_at_oohay.ac>
Date: Sun, 22 Jul 2007 22:30:45 GMT
Message-ID: <pUQoi.136960$xq1.72930@pd7urf1no>


vldm10 wrote:
> On Jul 14, 10:20 am, kaja_love..._at_yahoo.com wrote:
>
>

>>>>3)
>>>>What is the difference between model and scheme?
>>
>>>These terms are in this context usually used synonymously.
>>
>>>-- Jan Hidders
>>
>>And what is the difference between the two when used in some other
>>database context ?
>>
>>thank you

>
>
> If we are speaking about DB theory based on modern mathematics then a
> schema is kind of a language and a model is kind of a structure. We
> can say that structure A is a model for schema R in the sense that R
> is true in A.
> Briefly, one particular database is a model for corressponding
> schema.
> Above is related to "logical data model".
>
> Vladimir Odrljin
>
>

well, that certainly straightens it all out! Received on Sun Jul 22 2007 - 17:30:45 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US