Multiple ways to change root password in MySQL

Method 1: Use the SET PASSWORD command

　　mysql -u root
 
　　mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

　　mysqladmin -u root password "newpass"

　　mysqladmin -u root password oldpass "newpass"

　　mysql -u root
 
　　mysql> use mysql;
 
　　mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
 
　　mysql> FLUSH PRIVILEGES;

　　mysqld_safe --skip-grant-tables&
 
　　mysql -u root mysql
 
　　mysql> UPDATE user SET password=PASSWORD("new password") WHERE user='root';
 
　　mysql> FLUSH PRIVILEGES;