1. 设置口令：
UPDATE user SET Password=PASSWORD('9999') WHERE user='root';
FLUSH PRIVILEGES;
2.登陆 mysql -u root -p
3. 进入数据，创建一个新账号ut_one 密码是 8888
use mydb;
GRANT ALL PRIVILEGES ON *.* TO ut_one@localhost IDENTIFIED BY '8888' WITH GRANT OPTION;
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