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MySQL - get difference between two columns

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In this article, we would like to show you how to get the difference between two columns in MySQL.

Quick solution:

SELECT `column1`, `column2`, `columnN`,
    `column1`-`column2` AS 'alias_name'
FROM `values`;

Practical example

To show how to get the difference between two columns, we will use the following values table:

MySQL - example data used to get the difference between columns
MySQL - example data used to get the difference between columns

Note:

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

Example

In this example, we will get the difference between max_value and min_value columns from values table.

Query:

SELECT `id`, `min_value`, `max_value`, 
    `max_value`-`min_value` AS 'difference'
FROM `values`;

Output:

MySQL - get the difference between columns - result
MySQL - get the difference between columns - result

Database preparation

create_tables.sql file:

CREATE TABLE `values` (
	`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
	`min_value` INT,
	`max_value` INT,
	PRIMARY KEY (`id`)
);

insert_data.sql file:

INSERT INTO `values`
    (`min_value`, `max_value`)
values
    (1000, 1500),
    (1500, 2000),
    (1400, 2500),
    (1200, 3000),
    (1800, 3500);

MySQL - Problems

MySQL - get difference between two columns
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