Re: insert to projection
From: paul c <toledobythesea_at_oohay.ac>
Date: Fri, 04 Sep 2009 20:12:07 GMT
Message-ID: <rweom.42715$Db2.5484_at_edtnps83>
>
> View is a named RA expression.
> ...
Date: Fri, 04 Sep 2009 20:12:07 GMT
Message-ID: <rweom.42715$Db2.5484_at_edtnps83>
Tegiri Nenashi wrote:
> On Sep 4, 10:52 am, paul c <toledobythe..._at_oohay.ac> wrote:
>> Tegiri Nenashi wrote: >> >> ... >> >>> The only RA operation, that seems to allow view updates is renaming. >> Since when does RA have views?
>
> View is a named RA expression.
> ...
In other words, view is a language device. RA has no ambiguity, so if your chosen dbms language allows ambiguous results, it is due to your choice of language, just as Russell's paradox was due to the language he chose.
A base is a named RA expression, so what is the logical difference? Received on Fri Sep 04 2009 - 22:12:07 CEST