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Home -> Community -> Usenet -> comp.databases.theory -> Re: Idempotence and "Replication Insensitivity" are equivalent ?

Re: Idempotence and "Replication Insensitivity" are equivalent ?

From: Jan Hidders <hidders_at_gmail.com>
Date: 23 Sep 2006 02:04:49 -0700
Message-ID: <1159002289.301634.300250@k70g2000cwa.googlegroups.com>

Aloha Kakuikanu wrote:
> Jan Hidders wrote:
> > You'd split that into computing (minDate, maxDate) and then do some
> > post-processing. For (minDate, maxDate) you get:
> > - E = (null, null)
> > - S(d) = (d,d)
> > - A((d1, d2), (d3, d4)) = (MIN(d1, d3), MAX(d2, d4))
> > with MIN and MAX defined such that MIN(d, null) = MIN(null, d) = MAX(d,
> > null) = MAX(null, d) = d.
>
> This null thingy doesn't make sence:

Nulls rarely do. In this case I was only concerned with defining an example of (E,S,A), so I don't care my MIN and MAX don't satisify the law of absorption.

Received on Sat Sep 23 2006 - 04:04:49 CDT

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