A view can prevent unauthorized users from having access to sensitive data.
The application program can access the data it needs in a table, without having access to sensitive or restricted data in the table. A view can restrict access to particular columns by not specifying those columns in the SELECT list (for example, employee salaries). A view can also restrict access to particular rows in a table by specifying a WHERE clause (for example, allowing access only to the rows associated with a particular department number).