Re: object algebra

> > If you believe that relations are unnecessary, then you
> > should be able to do it without directly encoding a relation into
> > your expression.

Relation (header/tuples) is a construct within relational algebra. But since Codd added rules to that construct, he limited its ability to express. Codd rightly added the rules because it reduces the complexity of dealing with common applications. The side effect is, the rules make it less practical for uncommon applications such as the example at www.xdb1.com/Example/Ex076.asp Received on Thu Feb 26 2004 - 18:07:28 CET