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$xq1.72930_at_pd7urf1no>
>
>
> If we are speaking about DB theory based on modern mathematics then a
> schema is kind of a language and a model is kind of a structure. We
> can say that structure A is a model for schema R in the sense that R
> is true in A.
> Briefly, one particular database is a model for corressponding
> schema.
> Above is related to "logical data model".
>
> Vladimir Odrljin
>
>
Date: Sun, 22 Jul 2007 22:30:45 GMT
Message-ID: <pUQoi.136960$xq1.72930_at_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 Mon Jul 23 2007 - 00:30:45 CEST