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DBMS SQL View

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Views in SQL

  • Views in SQL are considered as a virtual table. A view also contains rows and columns.
  • To create the view, we can select the fields from one or more tables present in the database.
  • A view can either have specific rows based on certain condition or all the rows of a table.

Sample table:

Student_Detail

STU_ID NAME ADDRESS
1 Stephan Delhi
2 Kathrin Noida
3 David Ghaziabad
4 Alina Gurugram

Student_Marks

STU_ID NAME MARKS AGE
1 Stephan 97 19
2 Kathrin 86 21
3 David 74 18
4 Alina 90 20
5 John 96 18

1. Creating view

A view can be created using the CREATE VIEW statement. We can create a view from a single table or multiple tables.

Syntax:

CREATE VIEW view_name AS
SELECT column1, column2.....
FROM table_name
WHERE condition;

2. Creating View from a single table

In this example, we create a View named DetailsView from the table Student_Detail.

Query:

CREATE VIEW DetailsView AS
SELECT NAME, ADDRESS
FROM Student_Details
WHERE STU_ID < 4;

Just like table query, we can query the view to view the data.

SELECT * FROM DetailsView;

Output:

NAME ADDRESS
Stephan Delhi
Kathrin Noida
David Ghaziabad

3. Creating View from multiple tables

View from multiple tables can be created by simply include multiple tables in the SELECT statement.

In the given example, a view is created named MarksView from two tables Student_Detail and Student_Marks.

Query:

CREATE VIEW MarksView AS
SELECT Student_Detail.NAME, Student_Detail.ADDRESS, Student_Marks.MARKS
FROM Student_Detail, Student_Mark
WHERE Student_Detail.NAME = Student_Marks.NAME;

To display data of View MarksView:

SELECT * FROM MarksView;

NAME ADDRESS MARKS
Stephan Delhi 97
Kathrin Noida 86
David Ghaziabad 74
Alina Gurugram 90

4. Deleting View

A view can be deleted using the Drop View statement.

Syntax

DROP VIEW view_name;

Example:

If we want to delete the View MarksView, we can do this as:

DROP VIEW MarksView;

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