Re: view of view

Keith Worthington wrote:
> Hi All,
>
> I am working on an application that uses PostgreSQL.  One of the
> functions of the application is to generate reports.  In order to keep
> the code in the application simple we create a view of the required data
> in the database and then simply execute a SELECT * FROM
> view_of_the_data;  All of the manipulation and most of the time even the
> ordering is handled in the view.
>
> My question is how much if any performance degradation is there in
> creating a view of a view?
>
> IOW if I have a view that ties together a couple of tables and
> manipulates some data what will perform better; a view that filters,
> manipulates, and orders the data from the first view or a view that
> performs all the necessary calculations on the original tables?

from personal experience, if the inner views contain outer joins performance
isn't that great.

--

   - Rich Doughty