MySQL 5.7修改默认密码

修改mysql.user方式修改密码
mysql> update mysql.user set authentication_string=password('123qwe') where user='svoid' and Host = 'localhost';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MySQL5.7修改mysql数据库的user表的时候，不能再用 update user set password=password("123456") where user="root";