> This is maybe a newbie question, but what is the difference with a
> materialized view ?
> 

An updateable view is one you can insert, delete or update rows.
A materialized view is one that is pre-executed... i mean, that the
data is stored in a file for fast execution of the view

-- 
regards,
Jaime Casanova
(DBA: DataBase Aniquilator ;)

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