View in SQL Server

Introduction

In this article, I describe Views in SQL Server. This is a simple topic. I hope this article will help you just like my Windows Store articles. Please give me your valuable suggestions and feedback to improve my articles.
 
What is a View
 
Views are database objects which are like virtual tables that have no physical storage and contains data from one table or multiple tables. A View does not have any physical storage so they do not contain any data. When we update, insert or apply any operation over the View then these operations are applied to the table(s) on which the view was created.
 
Types Of View
  1. System View
  2. User Define View

User Defined Views are important so I describe only User Defined Views. They are of two types:

  1. Simple View
  2. Complex view

Simple View

When a View is created on a single Table than it is called a Simple View. We can apply all operations on a Simple View that we can apply on a table.
 
First of all we create a table on which we create a view.
  1. create table emp(empId int,empName varchar(15),empAdd varchar(15))  
Now insert data by the following code. 
  1. insert into emp  
  2. select 1,'deepak','UA'union all  
  3. select 2,'Middha','Punjab'union all  
  4. select 3,'d','Delhi'union all  
  5. select 4,'gourav','Noida'union all  
  6. select 5,'deepakia','Laksar'union all  
  7. select 6,'Deep','Haridwar'  

Table 

view-in-sql-table.jpg

Creation of a simple view
  1. create view v1  
  2. as  
  3. select * from emp  
Operation on view

See all the data of the view
  1. select * from v1  
view-in-sql-View.jpg

See the specific data of the view
  1. select * from v1 where empId=4   
view-in-sql-Views.jpg

Insertion

  1. insert into v1 values(7,'raj','canada');   
view-in-sql-insert.jpg
view-in-sql-insertafte.jpg
 
Updating 
  1. update v1 set empAdd='usa'where empId=7   
view-in-sql-update.jpg

Deletion

  1. delete from v1 where empId=7  
view-in-sql-insert.jpg

view-in-sql-table.jpg

Renaming 
  1. exec sp_rename 'v1','v11'   
Logic of the View
  1. exec sp_helptext v1  
view-in-sql-logic.jpg

Dropping the View
  1. drop view v1   
Encrypted View
  1. create view v1  
  2. with encryption  
  3. as  
  4. select * from emp  

Complex view

Views created on more than one table are called Complex View. We cannot perform all operations of a table on a Complex View.

First of all we create a table and insert some data 

  1. create table empStatus(empId int,empStatus varchar(10))  
  2.    
  3. insert into empStatus  
  4. select 1,'active'union all  
  5. select 2,'inactive'union all  
  6. select 4,'active'union all  
  7. select 5,'inactive'union all  
  8. select 6,'active'  

Table

  1. select * from empStatus  
  view-in-sql-empStatus.jpg

Creation of complex view 
  1. create View VComplex  
  2. as  
  3. select e.empId,e.empName,e1.empStatus from emp e inner join empStatus e1 on e.empId=e1.empId    
See all the records
  1. select * from VComplex  
view-in-sql-complexview.jpg
See specific record 
  1. select * from VComplex where empId=4  
view-in-sql-complex-view-specific.jpg

If we try insert, update or delete in a complex view then it shows an error as in the following
  1. insert into vcomplex values(11,'d','inactive')  
view-in-sql-complex-view-warning.jpg

Encryption of the Complex View
  1. create View VComplex  
  2. With encryption  
  3. as  
  4. select e.empId,e.empName,e1.empStatus from emp e inner join empStatus e1 on e.empId=e1.empId  
Summary
 
In this app I described Views in SQL Server. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.