How to change the root user's password in MySQL

Method 1: Use the SET PASSWORD command

mysql> set password for username@localhost = password('new password');
-- Examplemysql> set password for root@localhost = password('123');

Method 2: Using mysqladmin

mysql> mysqladmin -u username -p old password password new password;
-- Examplemysql> mysqladmin -uroot -p123456 password 123;

Method 3: Use UPDATE to edit the user table directly

mysql> use mysql;
mysql> update user set password=password('123') where user='root' and host='localhost';
mysql> flush privileges;

Method 4: When you forget the root password

Take Windows as an example:

1. Shut down the running MySQL service.
2. Open a DOS window and go to the mysql\bin directory.
3. Type mysqld --skip-grant-tables and press Enter. --skip-grant-tables means skipping the permission table authentication when starting the MySQL service.
4. Open another DOS window (because the previous DOS window can no longer be moved) and go to the mysql\bin directory.
5. Type mysql and press Enter. If successful, the MySQL prompt will appear>
6. Connection permission database: use mysql;
7. Change password: update user set password=password("123") where user="root";
8. Refresh privileges (required step): flush privileges;
9. Exit: quit
10. Log out of the system, log back in, and log in using the username root and the new password 123 you just set.

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