Languages
[Edit]
EN

MySQL - COUNT() function example

0 points
Created by:
Dirask Community
6810

In this article, we would like to show you how to use COUNT() function in MySQL.

Quick solution:

SELECT COUNT(*) AS `alias_name` FROM `table_name`;

Practical example

To show how the COUNT() function works, we will use the following table: 

MySQL - example data used with COUNT() function
MySQL - example data used with COUNT() function

Note:

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

Example

In this example, we will display the number of users.

Query: 

SELECT COUNT(*) AS `number of users` FROM `users`;

Output: 

MySQL - COUNT() function result
MySQL - COUNT() function 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', NULL, '6500.00'),
	('Gwendolyn', 'James', 2, '4200.00'),
	('Simon', 'Collins', 4, '3320.00'),
	('Taylor', 'Martin', 2, '1500.00'),
	('Andrew', 'Thompson', NULL, '2100.00');

MySQL - functions

Native Advertising
🚀
Get your tech brand or product in front of software developers.
For more information Contact us
Dirask - we help you to
solve coding problems.
Ask question.

❤️💻 🙂

Join