ALTER USER test@'%' IDENTIFIED BY '123456';

https://www.cnblogs.com/paul8339/p/9054497.html

更改用户名密码，官方推荐使用alter

ALTER USER test@'%' IDENTIFIED BY '123456';

还有一种

update mysql.user set authentication_string=password("新密码") where User="test" and Host="localhost";用update语句需要flush privileges;

 

参考

MySQL 5.7推荐使用ALTER USER修改密码 https://majing.io/posts/10000005531181

MySql 5.7中添加用户,新建数据库,用户授权,删除用户,修改密码 - Pkj - 博客园 https://www.cnblogs.com/pkjplayer/p/7681281.html