Re: A question for Mr. Celko

John Jacob wrote:
> I am clearly not understanding you, because it sounds to me like these
> two statements are contradicting each other. What about UNNESTing a
> relation-valued attribute is different from extraction? Why does that
> introduce any problems? I'm really trying to understand this because
> it would certainly change my view of non-scalar-valued attributes if
> it can be shown that they cause some major problem in the logical
> model. So far, I have not seen any compelling arguments that they do.

UNNESTing is part of the relational engine whereas extraction is part of the type engine?

So from the point of view of the relational engine the value should be atomic, but from the viewpoint of the type engine this doesn't have to be the case.

Paul. Received on Tue Jul 20 2004 - 19:15:29 CEST