MySQL - UPDATE statement

In this article, we would like to show you how to use UPDATE statement in MySQL.

Quick solution:

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UPDATE `table_name`

SET `column1` = value1, `column2` = value2, ...

WHERE condition;

Warning:

If you omit or construct wrong way the WHERE clause, all records will be updated!

To show how the UPDATE statement works, 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 update information about moderator Chris.

Query:

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UPDATE `users` 

SET `name` = 'Christopher', `role` = 'admin' 

WHERE `id` = 2;

Output:

Use below queries to prepare database and test UPDATE statement.

create_tables.sql file:

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CREATE TABLE `users` (

    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,

    `name` VARCHAR(100) NOT NULL,

    `role` VARCHAR(15) NOT NULL,

    PRIMARY KEY (`id`)

)

ENGINE=InnoDB;

insert_data.sql file:

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INSERT INTO `users`

    (`name`, `role`)

VALUES

    ('John', 'admin'),

    ('Chris', 'moderator'),

    ('Kate', 'user'),

    ('Denis', 'moderator');