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MySQL - CASE statement

3 points
Created by:
Emelia
237

In this article, we would like to show you how to useĀ CASEĀ statementĀ in MySQL.

Quick solution:

CASE
    WHEN condition1 THEN result1
    WHEN condition2 THEN result2
    WHEN conditionN THEN resultN
    ELSE result
END;

Practical example

To show how the CASEĀ statementĀ works, we will use the following table:

MySQL - example data used with CASEĀ statement
MySQL - example data used with CASEĀ statement

Note:

At the end of this article you can find database preparation SQL queries.

Example

In this example, we will display information about users salary using CASE statement.

Query:

SELECT `name`, `salary`,
CASE 
	WHEN `salary` > 6000 THEN 'Salary greater than 6000$'
	WHEN `salary` > 4000 THEN 'Salary greater than 4000$'
	WHEN `salary` >= 2000 THEN 'Salary greater than 2000$'
	ELSE 'Salary less than 2000$'
END AS 'Salary information'
FROM `users`;

Output:

MySQL - CASE statement result
MySQL - CASE statement result

Database preparation

create_tables.sqlĀ file:

CREATE TABLE `users` (
	`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
	`name` VARCHAR(50) NOT NULL,
	`surname` VARCHAR(50) NOT NULL,
	`department_id` INT(10) UNSIGNED,
    `salary` DECIMAL(15,2) NOT NULL,
	PRIMARY KEY (`id`)
);

insert_data.sqlĀ file:

INSERT INTO `users`
	( `name`, `surname`, `department_id`, `salary`)
VALUES
	('John', 'Stewart', 1, '3512.00'),
	('Chris', 'Brown', 2, '1344.00'),
	('Kate', 'Lewis', 3, '6574.00'),
	('Ailisa', 'Gomez', NULL, '6500.00'),
	('Gwendolyn', 'James', 2, '4200.00'),
	('Simon', 'Collins', 4, '3320.00'),
	('Taylor', 'Martin', 2, '1500.00'),
	('Andrew', 'Thompson', NULL, '2100.00');

MySQL

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