Re: Idempotence and "Replication Insensitivity" are equivalent ?

pamelafluente_at_libero.it writes:
> Aloha Kakuikanu ha scritto:
> > count() = sum(1)
>
> sum(1) = 1
>
> would mean:
> count(x1, ... , xn) constant for each x1, ... , xn and for each n

I know bugger all about database theory, so 'scuse my intrusion c.d.t dude(tte)s, but it's blatently obvious that the sum is over all the members of an implicit set. Therefore sum(1) must be |implicitset|.

Phil

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