Re: delete from a view

On Thu, 29 Apr 2004 10:34:43 -0400, Serge Rielau wrote:

> Interesting thread. Conceptualy there is nothing wrong with SQL deleting
> and updating through a UNION ALL. Any row clearly comes from one leg of
> the union all and that's where it ought to be updated/deleted.
> This has nothing to do with keys. It has to do with the DBMS remembering
> a rows origin (table id) in the same way it remembers a row's physical
> row id (to do update/delete).
> Using an instead of trigger does indeed work around the DBMS limitation,
> however it is semantically different when statement triggers come into
> play. The DELETE statements in the instead of trigger fires once per row.
> Also branch-elimination (as known in Oracle from partitioned tables I
> guess) is not possible in this case.
>
> This in turn begs the question:
> Why not use a partitioned table in the first place?
> Are the base tables heterogenious?
>
> Cheers
> Serge

All tables are from a Oracle Type inheriting from a common type (cf my previous post) Received on Thu Apr 29 2004 - 10:38:58 CDT