Re: Concurrency in an RDB
From: paul c <toledobythesea_at_oohay.ac>
Date: Fri, 22 Dec 2006 14:07:48 GMT
Message-ID: <UERih.507788$1T2.196362_at_pd7urf2no>
>
>
> I am guessing that one meaning you have in mind is that "it means the
> same as projecting from a relation (A,B) where B is an intgeger and
> (A,B) is an integer?
Date: Fri, 22 Dec 2006 14:07:48 GMT
Message-ID: <UERih.507788$1T2.196362_at_pd7urf2no>
paul c wrote:
> Bob Badour wrote:
...
>>> Let me re-ask that: what does it mean to project A from a relation >>> that has two attributes, one A of some specified/understood type and >>> the other B whose type is the same as the relation (A,B). >> >> >> >> It means the same as projecting A from a relation (A,B) where B is an >> integer. In the projection, B and its data type are irrelevant.
>
>
> I am guessing that one meaning you have in mind is that "it means the
> same as projecting from a relation (A,B) where B is an intgeger and
> (A,B) is an integer?
Sorry, I have to retract that second question as it no longer makes any sense to me. Will try to think of a better one.
p Received on Fri Dec 22 2006 - 15:07:48 CET