Re: Relation subset operators
From: <cimode_at_hotmail.com>
Date: Thu, 4 Jun 2009 02:09:51 -0700 (PDT)
Message-ID: <be041647-6498-44d8-80d9-8d4546537550_at_j20g2000vbp.googlegroups.com>
Date: Thu, 4 Jun 2009 02:09:51 -0700 (PDT)
Message-ID: <be041647-6498-44d8-80d9-8d4546537550_at_j20g2000vbp.googlegroups.com>
<<In a way this is a dual requirement to having two argument of the
same type! >>
I do not recall reading this but I have hard time understanding the
need for such limitation. What prevents performing an agrregate or
set operation between a relation type and a relation subtype (the
subtype using the type as a domain of possible values) ?.
Received on Thu Jun 04 2009 - 11:09:51 CEST