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About Views
Views are customized prcsentations of data in one or morc tablcs or other views. You can think of them as stored querics. Views do not actually contain data. but instead derive their data from the tables upon which they are based. Thesc tablcs are referred to as the base tables of the view.
Similar to tables, vicws can be quericd. updated, inserted into, and deleted from, with some restrictions. Ali operations performed on a view actually affcct the base tables of the view. Views can provide an additional levcl of security by restricting access to a predetermined set of rows and columns of a table. They can also hide data complexity and storę complex queries.
Many important views are in the SYS schema. There are two types: static data dictionary
views and dynamie performance views. Complete descriptions of the views in the SYS schema are in Oracle Database Reference.
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