问题描述：
安装好数据库MySQL，进入mysql，设置号密码后，退出的时候，利用密码无法进入，直接回车后可进入，无法看到数据库mysql，use mysql返回错误：ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'
参考地址：
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'
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