Re: Can relational alegbra perform bulk operations?
From: paul c <toledobythesea_at_oohay.ac>
Date: Tue, 29 Sep 2009 22:14:41 GMT
Message-ID: <lFvwm.45870$Db2.27580_at_edtnps83>
>
> But this is like saying that one can't define summation and
> multiplication in a ring with abstract elements. You wouldn't insist
> that any advanced algebra book had a long arithmetic introduction with
> tedious instructions how one adds and multiplies numbers (in their
> decimal representation)?
Date: Tue, 29 Sep 2009 22:14:41 GMT
Message-ID: <lFvwm.45870$Db2.27580_at_edtnps83>
Tegiri Nenashi wrote:
> On Sep 29, 1:01 pm, paul c <toledobythe..._at_oohay.ac> wrote:
>> Tegiri Nenashi wrote: >> >> ... >> >>> It is too vague. Algebras, in general, don't care about the structure >>> of their elements; relational algebra, in particular, doesn't refer to >>> tuples. ... >> It might be clearer to say that while the algebra's ops don't refer to >> tuples, the sets involved certainly do contain tuples and as far as I >> know, there are no relational ops that can be defined without reference >> to tuples.
>
> But this is like saying that one can't define summation and
> multiplication in a ring with abstract elements. You wouldn't insist
> that any advanced algebra book had a long arithmetic introduction with
> tedious instructions how one adds and multiplies numbers (in their
> decimal representation)?
When it comes to relational algebra, I doubt if there are any advanced books! Received on Wed Sep 30 2009 - 00:14:41 CEST