Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

In article <1120752683.210330.79280_at_g44g2000cwa.googlegroups.com>, mikharakiri_nospaum_at_yahoo.com says...
> User defined types

Whether they are user defined or not does not really matter.

> present rather archaic approach to units. Modern
> approach is symbolic manipulation
>
> http://tinyurl.com/68rbm

I'm not able to make sense of this. What are the domains of your relations? What does null mean? Is "<distance = 20 meters, time = 3 hours>" really a predicate? How does the system solve your 34477.985 = x*lb equation? In what way is this simpler or better than possreps?

-- 
Jon