MySQL change root password

 
Method 1: Log in to MySQL first  with the SET PASSWORD command .
Format: mysql> set password for username@localhost = password('new password'); 
Example: mysql> set password for root@localhost = password('123'); 

Method 2: Use mysqladmin 
format: mysqladmin -u username -p old password password New password 
example: mysqladmin -uroot -p123456 password 123 

Method 3: Edit the user table directly with UPDATE 
First log in to MySQL. 
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, you can  
use windows like this For 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 to skip permission table authentication when starting the MySQL service. 
4. 
5. Type mysql and press Enter. If successful, the MySQL prompt > will appear. 
6. Connect to the permission database: use mysql; . 
6. Change the password: update user set password=password("123") where user="root"; (don't forget to add a semicolon at the end). 
7. Refresh privileges (required step): flush privileges; . 
8. Exit quit. 
9. Log out of the system, log in again, and log in with the username root and the new password 123 just set.