Sql Views
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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