Re: A new proof of the superiority of set oriented approaches: numerical/time serie linear interpolation

Brian Selzer wrote:
> I don't think so. D&D's interpretation of the model is great for dealing
> with individual snapshots of data. If there were no need for transition
> constraints, then their interpretation would be sufficient. But I perceive
> a need, and even D&D perceive that need: it's RM Very Strong Suggestion # 4!

And they show how to solve it, in the very same VSS. If I understand you correctly, you reject their scheme because you consider it insufficient in the face of key updates. Right?

I don't think the semantics of key updates is as clear-cut as you think, though. It may seem intuitively obvious that when you update the sole key of a "Person" relvar, you are still talking about the same person (speaking loosely). But this is entity thinking, which is fuzzy, and dangerous to mix with relational theory. I am skeptical as to whether this notion of "sameness" can be formalised, and generalised to the less obvious cases.

-- 
Jon