MySQL 8.4修改初始化后的默認(rèn)密碼

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（1）初始化mysql：

mysqld --initialize --console

（2）之后,mysql會(huì)生成一個(gè)默認(rèn)復(fù)雜的密碼，如果打算修改這個(gè)密碼，可以先用舊密碼登錄：

mysql -u root -p 舊密碼

（3）然后：

alter user 'root'@'localhost' identified by '新密碼';

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