TRM and sorts
From: paul c <toledobythesea_at_oohay.ac>
Date: Wed, 05 Sep 2007 02:22:22 GMT
Message-ID: <ypoDi.127223$fJ5.23764_at_pd7urf1no>
I wonder if anybody here has spent much time thinking about the practicalities of the "trans-relational model"?
Date: Wed, 05 Sep 2007 02:22:22 GMT
Message-ID: <ypoDi.127223$fJ5.23764_at_pd7urf1no>
I wonder if anybody here has spent much time thinking about the practicalities of the "trans-relational model"?
I can see its value for joins that don't involve projections of relations that have a great many attributes, however it seems to assume that all "tables" are pre-sorted (which for some apps I think is a reasonable assumption) and since "ORDERing" often involves permutations of attributes, I think that any implementation that supports ordering on multiple attributes must either pre-sort every permutation of attributes or implement the equivalent of a run-time sort.
p Received on Wed Sep 05 2007 - 04:22:22 CEST