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@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 - 08:07:48 CST