Re: On view updating
Date: Wed, 22 Sep 2004 01:49:18 +0200
Message-ID: <tnd1l01puuept0m58fj065ftg3vhv41pe5_at_4ax.com>
On Tue, 21 Sep 2004 13:05:03 -0700, Costin Cozianu
<c_cozianu_at_hotmail.com> wrote:
In that case views are variables. Views and base relvars are interchangeable and indistinguishable. An user can't know if he is working with a table or a view.
BTW PL theory is not closed and we can introduce "virtual variables" and even weirder things.
>- views do not denote a "store".
Why not?
>as opposed to views, tables, which also have a name:
>
>- denote a "store". A place in the global state holding a value that can
>be changed.
If you consider closed views as views they also denote a "store" in the external level.
Do you consider closed views as tables?
>Therefore, here you have your trivial distinction in all imperative
>languages between a "store" (variable, possibly aliased or non-aliased)
>which is your lvalue, and an expression.
Regards Received on Wed Sep 22 2004 - 01:49:18 CEST