Re: constraints in algebra instead of calculus
Date: Mon, 18 Jun 2007 15:58:57 GMT
Message-ID: <5Zxdi.5389$M%4.1468_at_trndny08>
"paul c" <toledobythesea_at_oohay.ac> wrote in message
news:MtUci.31107$NV3.16822_at_pd7urf2no...
> paul c wrote:
> ...
> > ... In other words, when all
> > attributes are grouped, the result has the same number of rows as the
> > input.
> > ...
>
> If this is right, what I don't see is how one could GROUP a table with
> more more than one row and get a result that had only one row unless
> some projection to eliminate an attribute was made after grouping on all
> attributes except the one that is subsequently projected away. Not sure
> if that matters though.
PMFJI. I'm not following much of this discussion, but I want to ask the
following.
If you were to GROUP on no attributes at all, wouldn't you get a result
with only one row?
>
> p
Received on Mon Jun 18 2007 - 17:58:57 CEST