Re: Can relational alegbra perform bulk operations?

From: Tegiri Nenashi <tegirinenashi_at_gmail.com>
Date: Tue, 29 Sep 2009 14:54:54 -0700 (PDT)
Message-ID: <bb6ab928-cf93-4a46-ac41-e058a1305d13_at_f16g2000yqm.googlegroups.com>



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)? Received on Tue Sep 29 2009 - 16:54:54 CDT

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