What is the purpose of creating Oracle views?

There are several main purposes for creating Oracle views.

1. Simplify complex queries by creating views, which encapsulate complex query statements, making it easier for users to interact with data.
2. Data security: By using views, access to data can be restricted for users, allowing them to only access a portion of the data within the view rather than directly accessing the data in the table.
3. Data independence: Using views can conceal the structure of data tables, allowing users to manipulate data through views without the need to understand the underlying data table structure.
4. Logical data independence: By using views, multiple related tables can be linked together to provide users with a logical data view, without the need for users to understand the relationships between tables.
5. Performance optimization: By precomputing and storing some commonly used complex calculation results through views, query performance is improved.

In general, creating Oracle views can make it easier for users to manipulate and manage data, improving the security and performance of the database.