Re: Can relational alegbra perform bulk operations?

From: paul c <>
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 <> 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 Tue Sep 29 2009 - 17:14:41 CDT

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