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MySQL - sum value for grouped rows
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In this article, we would like to show you how to find sum value for grouped rows in MySQL.
Quick solution:
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SELECT `column1`, SUM(`column2`)
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FROM `table_name`
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GROUP BY `column1`;
To show how to find sum value for grouped rows, we will use the following table:

Note:
At the end of this article you can find database preparation SQL queries.
In this example, we will select the sumsalary
value for each department.
Query:
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SELECT department_id, sum(salary) AS 'total_salary'
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FROM `users`
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GROUP BY `department_id`;
Result:

create_tables.sql
file:
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CREATE TABLE `users` (
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`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
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`name` VARCHAR(50) NOT NULL,
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`surname` VARCHAR(50) NOT NULL,
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`email` VARCHAR(100),
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`department_id` INT(10) UNSIGNED,
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`salary` DECIMAL(15,2) NOT NULL,
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PRIMARY KEY (`id`)
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);
insert_data.sql
file:
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INSERT INTO `users`
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( `name`, `surname`, `email`, `department_id`, `salary`)
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VALUES
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('John', 'Stewart', 'john@email.com', 1, '3512.00'),
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('Chris', 'Brown', 'chris@email.com', 2, '1344.00'),
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('Kate', 'Lewis', NULL, 3, '6574.00'),
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('Ailisa', 'Gomez', 'ailisa@email.com', 3, '6500.00'),
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('Gwendolyn', 'James', NULL, 2, '4200.00'),
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('Simon', 'Collins', NULL, 1, '3320.00'),
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('Taylor', 'Martin', NULL, 2, '1500.00'),
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('Andrew', 'Thompson', 'andrew@email.com', 1, '2100.00');