1396 - Operation ALTER USER failed for 'root'@'localhost'

139 - Operation ALTER USER failed for 'root'@'localhost'是MySQL数据库中的错误代码，表示在尝试更改用户'root'@'localhost'的属性时发生了错误。
解决这个问题的方法如下：
1. 首先，您可以检查MySQL数据库中的user表中用户'root'的plugin字段。可以使用以下命令查看：select host,user,plugin from user;
2. 如果发现用户'root'的plugin字段不是'mysql_native_password'，您可以尝试以下操作：
a. 进入MySQL数据库，可以使用以下命令：mysql -u root -p
b. 执行以下命令来修改密码并将plugin字段设置为'mysql_native_password'：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_new_password';
c. 将'your_new_password'替换为您想要设置的新密码。
3. 如果用户'root'不存在，您可以尝试创建一个新的'root'用户，并按照上述步骤设置密码和plugin字段。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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