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SQL - Views
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  Simple views

A view can filter some rows from the base table or project only some columns from it:

CREATE VIEW new_employees_details AS
SELECT E.id, Fname, Salary, Hire_date
FROM Employees E
WHERE hire_date > date '2015-01-01';

If you select form the view:

select * from new_employees_details
Id FName Salary Hire_date
4 Johnathon 500 24-07-2016
  Complex views

A view can be a really complex query(aggregations, joins, subqueries, etc). Just be sure you add column names for everything you select:

Create VIEW dept_income AS
SELECT d.Name as DepartmentName, sum(e.salary) as TotalSalary
FROM Employees e
JOIN Departments d on e.DepartmentId = d.id
GROUP BY d.Name;

Now you can select from it as from any table:

SELECT * 
FROM dept_income;
DepartmentName TotalSalary
HR 1900
Sales 600
 

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