What are the uses of view?

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1. Views can represent a subset of the data contained in a table; consequently, a view can
limit the degree of exposure of the underlying tables to the outer world: a given user may
have permission to query the view, while denied access to the rest of the base table.
2. Views can join and simplify multiple tables into a single virtual table
3. Views can act as aggregated tables, where the database engine aggregates data (sum,
average etc.) and presents the calculated results as part of the data
4. Views can hide the complexity of data; for example a view could appear as Sales2000 or
Sales2001, transparently partitioning the actual underlying table.
5. Depending on the SQL engine used, views can provide extra security.