EN
MySQL - count rows in column
0 points
In this article, we would like to show you how to count rows in a column in MySQL.
Quick solution:
xxxxxxxxxx1
SELECT COUNT(`column_name`)2
FROM `table_name`;To show how to count distinct values, 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 count the number of unique countries in users table.
Query:
xxxxxxxxxx1
SELECT COUNT(DISTINCT(`country`)) AS `unique_countries`2
FROM `users`;Output:
create_tables.sql file:
xxxxxxxxxx1
CREATE TABLE `users` (2
`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,3
`name` VARCHAR(50) NOT NULL,4
`surname` VARCHAR(50) NOT NULL,5
`email` VARCHAR(50),6
PRIMARY KEY (`id`)7
);8
insert_data.sql file:
xxxxxxxxxx1
INSERT INTO `users`2
( `name`, `surname`, `email`)3
VALUES4
('John', 'Stewart', 'john@email.com'),5
('Chris', 'Brown', NULL),6
('Kate', 'Lewis', NULL),7
('Ailisa', 'Gomez', 'ailisa@email.com'),8
('Gwendolyn', 'James', NULL),9
('Simon', 'Collins', NULL),10
('Taylor', 'Martin', NULL),11
('Andrew', 'Thompson', 'andrew@email.com');