创建用户1CREATE USER 'username'@'localhost' IDENTIFIED BY 'password123'; 删除用户1DROP USER 'username'@'localhost'; 授予用户权限12GRANT SELECT, UPDATE ON foo.* TO 'username'@'localhost';FLUSH PRIVILEGES; 查看某个用户的权限1SHOW GRANTS FOR 'username'@'localhost'; 删除用户权限12REVOKE ALL PRIVILEGES ON foo.* FROM 'username'@'localhost';FLUSH PRIVILEGES;