要引用MySQL 8.0.15 +， password()函数不可用。使用下面的命令。

请使用

UPDATE mysql.user SET authentication_string='password' WHERE User='root';

$ export PATH=$PATH:/usr/local/mysql/bin

now,to make this permanent:
$ echo 'export PATH=$PATH:/usr/local/mysql/bin' >> ~/.bash_profile

next, start mysql in safe mode:
$ sudo mysqld_safe --skip-grant-tables;

If this does not work, go to System Preferences and stop MySQL server.
next, On the **other** terminal, you may use the below:

$ mysql -u root

mysql> USE mysql;

mysql> UPDATE mysql.user SET authentication_string=null WHERE 
User='root';

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ mysql -u root
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH 
caching_sha2_password BY 'yourpassword';

$ mysql -u root -p
Enter password: 
mysql> SELECT user();

next, start the mysql server in normal mode. and you're done with resetting your root password. this worked for mysql 8.0.17 ver. for me.
thanks to everyone on top, https://stackoverflow.com/questions/36099028/error-1064-42000-you-have-an-error-in-your-sql-syntax-want-to-configure-a-pa,

https://www.houseninetytwo.com/how-to-use-mysql-in-terminal-on-mac-os-high-sierra/: ~:文本=你% 5月20日% 20 % 20了% 20,% 2 fmysql % 2 fbin % 2 fmysql。= % 20应该% 20执行% 20 % 20对,返回% 20 % 20版本% % 20 mysql中的20个。

现有答案中提到的方法不适用于MySQL 5.7.6或更高版本。根据MySQL文档，这是推荐的方法。

B.5.3.2.3重置Root用户密码:通用说明

MySQL 5.7.6及以上版本:

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';

参考:https://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html

停止mysqld服务器。

Mac OS X:系统首选项→MySQL→停止MySQL服务器 Linux(从终端):sudo systemctl停止mysqld.service

Start the server in safe mode with privilege bypass From Terminal: sudo /usr/local/mysql/bin/mysqld_safe --skip-grant-tables In a new terminal window: sudo /usr/local/mysql/bin/mysql -u root This will open the MySQL command-line client. From here enter: UPDATE mysql.user SET authentication_string=PASSWORD('NewPassword') WHERE User='root'; FLUSH PRIVILEGES; quit Stop the mysqld server again and restart it in normal mode. Mac OS X (From Terminal): sudo /usr/local/mysql/support-files/mysql.server restart Linux Terminal: sudo systemctl restart mysqld

在终端试试这个:

/usr/local/bin/mysql_secure_installation

mysqld_safe --skip-grant-tables
mysql -u root
UPDATE mysql.user SET authentication_string='yourpasswd' WHERE User='root';
FLUSH PRIVILEGES;
ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'yourpasswd';

每次我的MacBook重启时，我都需要这样做。