mysql error 1045 access denied for user code example

Example 1: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

# Stop Your Server First
sudo service mysql stop

# Make MySQL service directory.
sudo mkdir /var/run/mysqld

# Give MySQL permission to work with the created directory
sudo chown mysql: /var/run/mysqld

# Start MySQL, without permission and network checking
sudo mysqld_safe --skip-grant-tables --skip-networking &

# Log in to your server without any password.
mysql -u root mysql


# Update the password for the root user:
UPDATE mysql.user SET authentication_string=PASSWORD('YourNewPasswordBuddy'), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';

#if you omit (AND Host='localhost') section, it updates the root pass regardless of its host

FLUSH PRIVILEGES;
EXIT;

#kill mysqld_safe process
sudo service mysql restart

#Now you can use your new password to login to your Server
mysql -u root -p

#take note for remote access you should create a remote user and then grant all privileges to that remote user

Example 2: windows error 1045 (28000): access denied for user 'root'@'localhost' (using password: yes)

update user set authentication_string=password('my_password') where user='root';

Example 3: ERROR 1045 (28000): Access denied for user 'ananyapam'@'localhost' (using password: NO)

sudo mysql -u root -p

Example 4: mysql error 1045

mysql> SELECT Host, User, authentication_string, PASSWORD('forgotten') FROM mysql.user WHERE User='nonexistant';  
+-------------+-------------+-------------------------------------------+-------------------------------------------+
| Host        | User        | authentication_string                     | PASSWORD('forgotten')                     |
+-------------+-------------+-------------------------------------------+-------------------------------------------+
| 192.168.0.1 | nonexistant | *AF9E01EA8519CE58E3739F4034EFD3D6B4CA6324 | *70F9DD10B4688C7F12E8ED6C26C6ABBD9D9C7A41 |
| %           | nonexistant | *AF9E01EA8519CE58E3739F4034EFD3D6B4CA6324 | *70F9DD10B4688C7F12E8ED6C26C6ABBD9D9C7A41 |
+-------------+-------------+-------------------------------------------+-------------------------------------------+
2 rows in set, 1 warning (0.00 sec)