C:\Windows\system32>c:\Server\bin\mysql-8.0\bin\mysql.exe -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 17
Server version: 8.0.19 MySQL Community Server - GPL
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> ALTER USER 'root'@'localhost'
-> IDENTIFIED WITH mysql_native_password
-> BY 'pass';
Query OK, 0 rows affected (0.17 sec)
pass - ваш пароль.