Check out example codes for "default password of mysql". It will help you in understanding the concepts better.

Code Example 1

user:root
#The password is empty
password:
#If by accident you set the password and you don't remember it
service mysql stop #Stop mysql service
mysqld_safe --skip-grant-tables & #disable "login"
mysql #Log in into mysql, you should see mysql> in prompt
UPDATE mysql.user SET Password=PASSWORD('new-password') WHERE User='root';
FLUSH PRIVILEGES; #
exit; # exit from mysql
mysqladmin -u root -p shutdown # shutdown mysql service
service mysql start # Restart your service

Code Example 2

mysql_secure_connection

Code Example 3

mysqladmin -u root password NEWPASSWORD

Learn ReactJs, React Native from akashmittal.com