解決方法：先開啟終端，輸入指令「mysql -u root」；然後輸入指令「UPDATE mysql.user SET authentication_string=PASSWORD('新密碼') WHERE User='root';」。
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mac 登陸mysql忘記密碼解決方法
1、開啟終端，輸入指令：cd /usr/local/mysql/bin
##2 、mysql -uroot -p，用這條指令登陸時報錯誤訊息：
報錯：Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
3、開啟終端機輸入：sudo mysqld_safe --skip-grant-tables
輸出Password: Logging to '/usr/local/mysql/data/localhost.err'.2018-10-10T03:21:40.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
4、開啟一個新的終端，輸入：mysql -u root ，會看到以下輸出。
Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 16Server version: 5.7.23 MySQL Community Server (GPL) Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
5、終端機輸入use mysql顯示如下
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed
6、修改密碼：UPDATE mysql.user SET authentication_string=PASSWORD ('你的密碼') WHERE User='root';
Query OK, 1 row affected, 1 warning (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 1
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