Re: Pizza Example
Date: Fri, 09 Apr 2004 01:06:50 GMT
Dawn M. Wolthuis wrote:
> "Jan Hidders" <jan.hidders_at_REMOVETHIS.pandora.be> wrote in message
>>Dawn M. Wolthuis wrote:
>>>So, if "the Pizza has Mozzarella and Parmesan cheese" is stored as:
>>>in a single, uh, record, then if the ordering is unwittingly useful, we
>>>didn't harm that ordering.
>>Indeed, but you did make certain query-optimizations impossible.
> > If there were emperical data suggesting that queries on this model in PICK > were faster than those on a 1NF model in any DBMS purporting to be > relational, then I would not be concerned.
My goodness. Do I really have to explain to you what the trade-offs are between a DBMS with a declarative query language and a good query optimizer vs. a system with an imperative query language and no query optimizer? Could you, just to indulge me, sketch for me what you think the trade-offs are and under what circumstances you would prefer one type of system over the other?
- Jan Hidders