Re: constraints in algebra instead of calculus
From: paul c <toledobythesea_at_oohay.ac>
Date: Sat, 16 Jun 2007 16:46:36 GMT
Message-ID: <MtUci.31107$NV3.16822_at_pd7urf2no>
Date: Sat, 16 Jun 2007 16:46:36 GMT
Message-ID: <MtUci.31107$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.
p Received on Sat Jun 16 2007 - 18:46:36 CEST