What is View in SQL?
“Database provides us with a way to access or display the data using a virtual table rather than actual table called VIEW. These view not store the actual table data. View retrieve data from the actual Table and display that data. We can use SQL ‘select’ statement to retrieve data from the base table. Basically, the view is the good feature for security purposes, because when someone accesses data through the view, he just can access view rather than a base table.”
How to Create View in SQL
- Create View statement we use to create a view in SQL, the syntax is given below
- CREATE VIEW name of view
- SELECT name of columns
- FROM name of tables
- Where conditions
- Name of view: It name of the view you can select according to your requirement.
- Name of columns: In the select statement you can write the name of columns those you want to display in the view.
- Name of tables: In the table, names write the one or more tables names those you want to add in your view.
- Conditions: It optional depends on your business model.
How to create a view in SQL Server
It is important to handle views in server-side because mostly we create views in server-side to show client-side.
The syntax is almost same given above,
CREATE VIEW [OR ALTER] schema_name.view_name [ ( column_list ) ]
Create a view in SQL Server management studio using UI
SQL also provides a User interface for creating a view. The procedure is given below,
Open the SQL Server Management Studio is given in the image
Right Click the on view folder like this,
After the above step SQL server display all tables, then select table name which table you want to create a view,
After selecting and press Add button. Now your view is ready.
Create a view using different tables
I also mentioned in introductory or syntax part we can create one view that can a combination of multiple tables. Means a view can show different tables data.
CREATE VIEW view_name
SELECT column1, column2, column3 …
FROM table1, table2, table3 …
Create view in SQL server 2014
SQL has the same syntax for creating a view in all versions of SQL Servers like 2012, 2014 and 2015 etc.
Create a view in MySQL Developer
Now we are discussing the Database Management Systems. How to create views using different DBMS like Oracle, MySQL etc.
Database Management Systems provide a good way to create a view for users.
CREATE VIEW `view_name` AS SELECT statement;
A complete Example for creating View in SQL
The query for creating a view is given below,
CREATE VIEW [ Brazil Customers ] AS
SELECT CustomerName , ContactName
WHERE Country = ‘ Brazil ‘ ;
The resultant table is that create against the above query.
Your database Tables
View Query Result:
How do you create a view in SQL?
SQL Server CREATE VIEW
- First, specify the name of the view after the CREATE VIEW keywords. The schema_name is the name of the schema to which the view belongs.
- Second, specify a SELECT statement ( select_statement ) that defines the view after the AS keyword. The SELECT statement can refer to one or more tables.
What is a view in SQL with example?
Views in SQL are kind of virtual tables. A view also has rows and columns as they are in a real table in the database. We can create a view by selecting fields from one or more tables present in the database. A View can either have all the rows of a table or specific rows based on certain condition.
Why do we create view in SQL?
Views can join and simplify multiple tables into a single virtual table. Views can act as aggregated tables, where the database engine aggregates data (sum, average, etc.) and presents the calculated results as part of the data. Views can hide the complexity of data.
How do I create a complex view in SQL?
Complex views can be constructed on more than one base table. In particular, complex views can contain: join conditions, a group by clause, a order by clause. Contains only one single base table or is created from only one table. Contains more than one base tables or is created from more than one tables.
How can we insert a data into a view?
You can insert rows into a view only if the view is modifiable and contains no derived columns. The reason for the second restriction is that an inserted row must provide values for all columns, but the database server cannot tell how to distribute an inserted value through an expression.
What are the four different types of view?
Explain the different between all four types of views available.
- Database View ( SE11 )
- Help View ( SE54 )
- Projection View.
- Maintenance View ( SE54 )
What is true view?
Explanation: VIEW is a virtual table, through which a selective portion of the data from one or more tables can be seen. A view do not contain data of their own.
What is a type of view?
What is a view vs a table?
There are three types of pictorial views: perspective. isometric. oblique.
Is view faster than table SQL?
What is view in Snowflake?
1. A table is used to organize data in the form of rows and columns and displayed them in a structured format. It makes the stored information more understandable to the human. Views are treated as a virtual/logical table used to view or manipulate parts of the table.
How do you create a view?
Views make queries faster to write, but they don’t improve the underlying query performance. Once we create an indexed view, every time we modify data in the underlying tables then not only must SQL Server maintain the index entries on those tables, but also the index entries on the view.
What Cannot be done on a view?
Tables and views are the primary objects created and maintained in database schemas: All data in Snowflake is stored in tables. Views can be used to display selected rows and columns in one or more tables.
How do you create a trigger?
To create a view, a user must have the appropriate system privilege according to the specific implementation. CREATE VIEW view_name AS SELECT column1, column2.. FROM table_name WHERE [condition]; You can include multiple tables in your SELECT statement in a similar way as you use them in a normal SQL SELECT query.
Is create view DDL?
What cannot be done on a view? Explanation: In MySQL, ‘Views’ act as virtual tables. It is not possible to create indexes on a view. However, they can be used for the views that are processed using the merge algorithm.
What is DDL example?
In the previous chapters, base tables were used to describe DDL and DML statements. A base table contains data stored on the disk. Thus, views are also called virtual tables.
How many DDL commands are there?
Data Manipulation Language is used to manipulate i.e. retrieve, update and delete the data in a database. The DDL commands that are used in SQL are CREATE, DROP, ALTER, TRUNCATE, etc. The DML commands used in SQL are INSERT, UPDATE, DELETE, SELECT, etc. The CREATE command is used to create a table or view of a table.