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
ATutorialHub Related Guide
-
.png "Sea battle game only using HTML and CSS")
Sea battle game only using HTML and CSSAdmin
sea battle game where using only HTML and CSS and animation in css and html tags sea battle game2021-09-20 03:43:36
Comments (8)
User Comments
panduranga gupta
2021-07-05 07:03:13good website for learning and help me a lot
raju
2021-09-25 14:58:47The awsome website i am looking like for a long time, good work atutorialhub team keep doing
Shivani
2021-09-01 15:03:56Learning a lot from the courses present on atutorialhub. The courses are very well explained. Great experience
Harshitha
2021-09-10 15:05:45It is very helpful to students and easy to learn the concepts
Sowmya
2021-09-14 15:06:41Great job Tutorials are easy to understand Please make use of it
Zain Khan
2021-09-18 15:07:23Great content and customized courses.
Rudrakshi Bhatt
2021-09-09 15:08:10Well structured coursed and explained really well!
Pavana Somashekar
2021-09-11 15:09:08Good platform for beginners and learn a lot on this website
Leave a Comment