>So if you know SQL, you absolutely don't know the relational model. The only person I know of here that at least knows what the relational model is about is Jim Booth.
>

I'll agree that Jim is quite knowledgable about RDBMS; I'd say that you've got some serious failures of understanding if you are attempting to directly equate the relational calculus operator set used to prove the mathematical validity of relational operations with SQL, which is a partial reflection of the underlying mathemtical model. Some of us have read Codd, and Date, and Ullman, and lots of other books on realtional theory and have even had the opportunity to do formal proofs of operations for database applications.

It's not worth debating with you. I leave others to judge the validity and value of your statements on their own merits. We've digressed far enough from the topic. You proposed something as a wishlist item. I said I didn't like it. You said that I needed to expand on it. I did. EOT.

In the future, if you just want people to agree with your ideas, don't ask our opinions of them. The odds are we'll tell you, and you won't like what you're told.