MySQL - count rows per day

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

Quick solution:

SELECT
    DATE(`datetime_column1`) AS 'alias1', 
    COUNT(*) AS 'alias2'
FROM `table_name`
GROUP BY DATE(`datetime_column1`);

Practical example

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

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 day.

Query:

SELECT
    DATE(`registration_time`) AS 'day', 
	COUNT(*) AS 'number_of_users'
FROM `users`
GROUP BY DATE(`registration_time`);

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');