Re: Basic question?What 's the key if there 's no FD(Functional Dependencies)?

Marshall schreef:

>
> It seems to me that whether a given update will succeed or not
> will not necessarily be able to be determined statically, but
> rather will depend on the current value of the variables involved.
> (And also the constraints of course.) So it's not clear to me
> what it would mean to say a view is updatable, with no
> further qualifications.

Indeed. If you want an idea of what the current thoughts on that are I can refer you to a very nice short clear summary in http://www.cis.upenn.edu/~bcpierce/papers/dblenses-tr.pdf

See "Related Work" on page 34.

Btw. the paper itself is also very interesting and represents what currently seems to be the most promising approach to the view update problem.

• Jan Hidders