Re: Natural keys vs Aritficial Keys
Date: Fri, 29 May 2009 15:04:02 GMT
David BL wrote:
> On May 29, 9:53 pm, paul c <toledobythe..._at_oohay.ac> wrote:
>> David BL wrote: >> >> ... >> >>> I have no idea what you mean by "relvars are structures (not logical >>> pointers presumably?". Please quote me rather than pretend to quote >>> me. >> > "... However with other ways of >> >> composing data structures, sub-variables may not exist. A relvar is >> >> one such example. ..." >> ... >> >> There's your quote for the second time.
> Good that's better. When I talk about composing data structures I'm
> speaking informally. If I wanted to be more precise I might talk
> about the way values can compose, or types can compose, or perhaps
> even see whether it's possible to formalise an idea that variables
> Now, what is your point?
Until you start being more precise, you will continue to go 'round in circles, mixing up concepts and losing the essential ones. Received on Fri May 29 2009 - 17:04:02 CEST