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MySQL - UPDATE query with IF condition (conditional update)

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In this article, we would like to show you UPDATE query with IF condition in MySQL.

Quick solution:

UPDATE `table_name`
SET `column_name` = IF(condition , if_true, if_false);

Practical example

To show UPDATE query with IF condition, we will use the following users table:

MySQL - example data used for conditional update
MySQL - example data used for conditional update

Note:

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

Example 1

In this example, we will update every department_id to 11 if it is equal to 1.

Query:

UPDATE `users`
SET `department_id` = IF( `department_id` = 1 , 11 , `department_id`);

Output:

MySQL - UPDATE query with IF condition - result
MySQL - UPDATE query with IF condition - result

Note:

Go to this article to see more IF() function practical examples.

Example 2 - with WHERE clause

Optionally you can add WHERE clause to Example 1.

In this example, we will update every department_id to 11 if it is equal to 1 but only for users whose id > 3.

Query:

SELECT * FROM `users` 
WHERE `salary` < (SELECT AVG(`salary`) 
FROM `users`);

Output:

MySQL - conditional UPDATE - result
MySQL - conditional UPDATE - result

Database preparation

create_tables.sql 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.sql 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', 1, '6500.00'),
	('Gwendolyn', 'James', 2, '4200.00'),
	('Simon', 'Collins', 4, '3320.00'),
	('Taylor', 'Martin', 2, '1500.00'),
	('Andrew', 'Thompson', 1, '2100.00');
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