Re: Idempotence and "Replication Insensitivity" are equivalent ?

Aloha Kakuikanu ha scritto:

> Rick Decker wrote:
> > Aloha Kakuikanu wrote:
> >
> > > pamelafluente_at_libero.it wrote:
> > >
> > >>... but in case of a Median date, how would you proceed?
> > >>Would it be all "postprocessing" ?
> > >
> > >
> > > There is no such thing as mediant aggregate function. The only
> > > aggregate functions are "sum" and "min/max". All the rest deduces to
> > > these.
> >
> > Maybe it's due to the late hour where I live, but it's not obvious
> > to me how one would define, say, "count" in terms of "sum" and
> > "min/max".
>
> count() = sum(1)

sum(1) = 1

would mean:
count(x1, ... , xn) constant for each x1, ... , xn and for each n

-P Received on Sat Sep 23 2006 - 11:50:52 CEST