Re: relative complement?
From: David BL <davidbl_at_iinet.net.au>
Date: Mon, 4 Apr 2011 01:54:44 -0700 (PDT)
Message-ID: <50a4a3ae-c17d-4d29-bd9a-e30c25099a30_at_z3g2000prz.googlegroups.com>
Date: Mon, 4 Apr 2011 01:54:44 -0700 (PDT)
Message-ID: <50a4a3ae-c17d-4d29-bd9a-e30c25099a30_at_z3g2000prz.googlegroups.com>
However, I'm very suspicious of an application allowing users to update a non-injective view of the data. More specifically if users of an application cannot in general distinguish distinct values of some base relvar how can they reasonably be expected to have permission to update that relvar? Received on Mon Apr 04 2011 - 10:54:44 CEST