MySQL DROP VIEW
Summary: in this tutorial, you will learn how to use the MySQL DROP VIEW
statement to delete a view from the database.
Introduction to the MySQL DROP VIEW
statement
The DROP VIEW
statement deletes a view completely from the database. Here’s the basic syntax of the DROP VIEW
statement:
DROP VIEW [IF EXISTS] view_name;
Code language: SQL (Structured Query Language) (sql)
In this syntax, you specify the name of the view that you want to drop after the DROP VIEW
keywords. The optional IF EXISTS
option conditionally removes the view only if it exists.
To remove multiple views in a single statement, you use the following syntax:
DROP VIEW [IF EXISTS] view_name1 [,view_name2]...;
Code language: SQL (Structured Query Language) (sql)
In this syntax, you specify a list of comma-separated views after the DROP VIEW keywords.
If the list contains a view that doesn’t exist, the DROP VIEW
statement will fail and won’t delete any view. However, if you use the IF EXISTS
option, the DROP VIEW
statement will generate a NOTE
for each non-existing view.
Note that in MySQL 5.7 or earlier, the DROP VIEW
returns an error if there is any non-existing view. However, it drops the views that exist.
MySQL DROP VIEW statement examples
Let’s take some examples of using the DROP VIEW
statement.
1) MySQL DROP VIEW – drop a view example
This statement creates a view named customerPayments
based on the customers
and payments
tables:
CREATE VIEW customerPayments
AS
SELECT
customerName,
SUM(amount) payment
FROM
customers
INNER JOIN payments
USING (customerNumber)
GROUP BY
customerName;
Code language: SQL (Structured Query Language) (sql)
This example uses the DROP VIEW
statement to drop the customerPayments
view:
DROP VIEW IF EXISTS customerPayments;
Code language: SQL (Structured Query Language) (sql)
2) MySQL DROP VIEW
– drop multiple views example
This statement creates a view named employeeOffices
based on the employees
and offices
tables:
CREATE VIEW employeeOffices AS
SELECT
firstName, lastName, addressLine1, city
FROM
employees
INNER JOIN
offices USING (officeCode);
Code language: SQL (Structured Query Language) (sql)
The following statement uses the DROP VIEW
statement to delete two views employeeOffices
and eOffices
:
DROP VIEW employeeOffices, eOffices;
Code language: SQL (Structured Query Language) (sql)
MySQL issued the following error:
Error Code: 1051. Unknown table 'classicmodels.eoffices'
Code language: SQL (Structured Query Language) (sql)
Let’s add the IF EXISTS
option like this:
DROP VIEW IF EXISTS employeeOffices, eOffices;
Code language: SQL (Structured Query Language) (sql)
MySQL issued a warning instead:
1 warning(s): 1051 Unknown table 'classicmodels.eoffices'
Code language: SQL (Structured Query Language) (sql)
The employeeOffices
view remains intact.
This statement creates a new view named productCatalogs
based on the products
and productLines
tables:
CREATE VIEW productCatalogs AS
SELECT
productLine, productName, msrp
FROM
products
INNER JOIN
productLines USING (productLine);
Code language: SQL (Structured Query Language) (sql)
The following example uses the DROP VIEW
statement to delete the employeeOffices
and productCatalogs
views:
DROP VIEW employeeOffices, productCatalogs;
Code language: SQL (Structured Query Language) (sql)
MySQL deleted the views completely.
Summary
- Use the
DROP VIEW
statement to delete one or more views from a database. - Use the
IF EXISTS
option to conditionally delete a view if it exists.