Re: relational algebra question

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,

• Jan Hidders