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MySQL - count rows per hour

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In this article, we would like to show you how to count rows per hour in MySQL.

Quick solution:

SELECT COUNT(*), HOUR(`timestamp_column_name`)
FROM `table_name`
GROUP BY HOUR(`timestamp_column_name`);

Note:

This solution works both for TIMESTAMP and DATETIME type.

 

Practical example

To show how to count rows per hour, we will use the following table:

MySQL - example data used to count rows per hour
MySQL - example data used to count rows per hour

Note:

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

Example

In this example, we will display the date and the number of registered users for each hour.

Query:

SELECT
    HOUR(`registration_time`) AS 'hour',
	COUNT(*) AS 'number_of_times'
FROM `users`
GROUP BY HOUR(`registration_time`);

Result:

MySQL - count rows per hour - result
MySQL - count rows per hour - result

Database preparation

create_tables.sql file:

CREATE TABLE `users` (
	`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
	`username` VARCHAR(50) NOT NULL,
	`registration_time` DATETIME NOT NULL,
	PRIMARY KEY (`id`)
);

insert_data.sql file:

INSERT INTO `users`
	(`username`, `registration_time`)
VALUES
	('Tom', '2021-01-01 11:41:31'),
	('Chris','2021-01-02 11:42:45'),
	('Jack','2021-01-03 15:13:39'),
    ('Kim','2021-01-03 15:24:51'),
    ('Marco','2021-01-04 22:35:38'),
	('Kate','2021-01-04 22:46:51'),
	('Nam','2021-01-04 22:57:37');

MySQL - dates

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