Re: Expressing SQL in relational algebra
From: Neo <neo55592_at_hotmail.com>
Date: 10 Apr 2003 08:35:44 -0700
Message-ID: <4b45d3ad.0304100735.620639bd_at_posting.google.com>
Date: 10 Apr 2003 08:35:44 -0700
Message-ID: <4b45d3ad.0304100735.620639bd_at_posting.google.com>
> > What is the advantage of expressing a query in relational algebra?
>
> Both the relational algebra and the relational calculus have a sound
> theoretical foundation, which is somewhat lacking in SQL. There are
> constructive proofs that the relational algebra and the relational
> calculus are equally expressive. Some might argue that automated query
> re-write is easier to implement for the algebra.
>
> An equally important question is: What is the advantage of expressing
> a query in anything but the relational algebra?
My question above was rhetorical, and I agree with you that expressing queries in relational algreba is preferrable. Received on Thu Apr 10 2003 - 17:35:44 CEST