Re: relational algebra question
From: Jan Hidders <jan.hidders_at_pandora.be>
Date: Wed, 10 Sep 2003 16:27:10 GMT
Message-ID: <yhI7b.12675$FL7.476299_at_phobos.telenet-ops.be>
Date: Wed, 10 Sep 2003 16:27:10 GMT
Message-ID: <yhI7b.12675$FL7.476299_at_phobos.telenet-ops.be>
riley wrote:
>
> I've been asked to write a Relational Algebra Expression to get the most
> expesive item
Hint: First write an algebra expression for the items that are *not* the most expensive. Then use this expression to build a bigger expression that computes the answer that you want.
In case you have trouble finding that particular expression let me remind you of the following trivial truth:
An item is not the most expensive one if there is another one that is more expensive.
Good luck,
Received on Wed Sep 10 2003 - 18:27:10 CEST