Re: Idempotence and "Replication Insensitivity" are equivalent ?

From: Marshall <marshall.spight_at_gmail.com>
Date: 19 Sep 2006 08:14:31 -0700
Message-ID: <1158678871.496274.134890_at_d34g2000cwd.googlegroups.com>

Chris Smith wrote:
>
> > - median
> > - Any quantile
> > - standard deviation
> > - variance
>
> These are not definable as aggregate functions.

They are if you use the accumulator approach. It's not always clear if efficient implementations exist.

Marshall Received on Tue Sep 19 2006 - 17:14:31 CEST

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