ERROR 1045 (28000): Access denied for user 'heladitooo'@'localhost' (using password: NO) code example

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

mysql -u root -p

Example 2: ERROR 1045 (28000): Access denied for user 'ananyapam'@'localhost' (using password: NO)

sudo mysql -u root -p