Обсуждение: views?

do views exist fysically a separate "table",
or are they generated on the fly whenever they are queried?

if they exist fysically they could improve performance (..php, web),
for example a view being a join between two or more tables..

tnx?

"Loeke" <LoekeDoeLoekeDoe@dontlikespam.hotmail.com> writes:
> do views exist fysically a separate "table", or are they generated
> on the fly whenever they are queried?

Views are implementing by rewriting queries into the appropriate query
on the view's base tables.

http://www.postgresql.org/docs/current/static/rules-views.html

> if they exist fysically they could improve performance (..php, web),

This is called a "materialized view". PostgreSQL doesn't support them
yet, but most people think it would be a Good Thing to have.

-Neil

On Saturday 31 January 2004 04:35, Neil Conway wrote:
>
> This is called a "materialized view". PostgreSQL doesn't support them
> yet, but most people think it would be a Good Thing to have.

There is a project on gborg (called "mview" iirc) though I don't know how far
it's got - I think it's still pretty new.

--
  Richard Huxton
  Archonet Ltd

> > This is called a "materialized view". PostgreSQL doesn't support them
> > yet, but most people think it would be a Good Thing to have.
>
> There is a project on gborg (called "mview" iirc) though I don't know how
far
> it's got - I think it's still pretty new.

tnx

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