- Introduction To SQL
- SQL Syntax
- SQL SELECT Statement
- SQL SELECT DISTINCT Statement
- SQL WHERE Clause
- SQL AND, OR And NOT Operators
- SQL ORDER BY Keyword
- SQL INSERT INTO Statement
- SQL NULL Values
- SQL UPDATE Statement
- SQL DELETE Statement
- SQL TOP, LIMIT, FETCH FIRST Or ROWNUM Clause
- SQL MIN() And MAX() Functions
- SQL COUNT(), AVG() And SUM() Functions
- SQL LIKE Operator
- SQL Wildcards
- SQL IN Operator
- SQL BETWEEN Operator
- SQL Aliases
- SQL Joins
- SQL INNER JOIN Keyword
- SQL LEFT JOIN Keyword
- SQL RIGHT JOIN Keyword
- SQL FULL OUTER JOIN Keyword
- SQL Self Join
- SQL UNION Operator
- SQL GROUP BY Statement
- SQL HAVING Clause
- SQL EXISTS Operator
- SQL ANY And ALL Operators
- SQL SELECT INTO Statement
- SQL INSERT INTO SELECT Statement
- SQL CASE Statement
- SQL NULL Functions
- SQL Stored Procedures For SQL Server
- SQL Comments
- SQL Operators
- SQL CREATE DATABASE Statement
- SQL DROP DATABASE Statement
- SQL BACKUP DATABASE For SQL Server
- SQL CREATE TABLE Statement
- SQL DROP TABLE Statement
- SQL ALTER TABLE Statement
- SQL Constraints
- SQL NOT NULL Constraint
- SQL UNIQUE Constraint
- SQL PRIMARY KEY Constraint
- SQL FOREIGN KEY Constraint
- ALTER TABLE Orders DROP CONSTRAINT FK_PersonOrder;
- SQL DEFAULT Constraint
- SQL CREATE INDEX Statement
- SQL AUTO INCREMENT Field
- SQL Working With Dates
- SQL Views
- SQL Injection
- SQL Hosting
- SQL Data Types For MySQL, SQL Server, And MS Access
SQL Views
SQL CREATE VIEW Statement
In SQL, a view is a virtual table based on the result-set of an SQL statement.
A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
You can add SQL statements and functions to a view and present the data as if the data were coming from one single table.
A view is created with the CREATE VIEW statement.
CREATE VIEW Syntax
SELECT column1, column2, ...
FROM table_name
WHERE condition;
Note: A view always shows up-to-date data! The database engine recreates the view, every time a user queries it.
Practice Excercise Practice now
SQL CREATE VIEW Examples
The following SQL creates a view that shows all customers from Brazil:
Example
SELECT CustomerName, ContactName
FROM Customers
WHERE Country = 'Brazil';
We can query the view above as follows:
Example
The following SQL creates a view that selects every product in the "Products" table with a price higher than the average price:
Example
SELECT ProductName, Price
FROM Products
WHERE Price > (SELECT AVG(Price) FROM Products);
We can query the view above as follows:
Example
Practice Excercise Practice now
SQL Updating A View
A view can be updated with the CREATE OR REPLACE VIEW statement.
SQL CREATE OR REPLACE VIEW Syntax
SELECT column1, column2, ...
FROM table_name
WHERE condition;
The following SQL adds the "City" column to the "Brazil Customers" view:
Example
SELECT CustomerName, ContactName, City
FROM Customers
WHERE Country = 'Brazil';
Practice Excercise Practice now
SQL Dropping A View
A view is deleted with the DROP VIEW statement.
SQL DROP VIEW Syntax
The following SQL drops the "Brazil Customers" view:
Example
Practice Excercise Practice now
Products
Partner
Copyright © RVR Innovations LLP 2024 | All rights reserved - Mytat.co is the venture of RVR Innovations LLP