View Objects in Oracle OAF

• View Objects represent a query Result.
• View Objects are used for joining, filtering, projecting, and sorting business data.
• View Objects are created based on any number of Entity Objects.
• View Objects can also be constructed from a SQL Statement.
•  The View Objects represents both the data i.e. SELECT statement & the operations or methods that can be performed on the data(get/set/validations).
• Most of the View Objects are defined decoratively, but there are even methods to programmatically create and Alter VOs at RUN time.
• View Objects are designed to manage collection of data i.e. main collection interface into the DataBase.
• View Objects provide view-like shaping of the data. It leverages SQL to join tables and corresponding Entity Objects. 
• The View Object allows us to do the action most often performed, query without the overhead of a full Entity Object which indirectly increase the performance of Oracle Application Framework pages. 
• View Objects ensures better usability of business logic (as it delegates to other objects such as Entity Object or PL/SQL for Business Logic).
• View Object contains only the attributes required for a specific purpose. So do not select more attributes i.e. columns than required for a Page.
• View Objects are considered for a specific page and are not expected to be reused.
• Never include business logic in View Object.