E:\zhurong_soft\MySQL\MySQL Server 8.1\bin>mysql -uroot
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Your MySQL connection id is 29
Server version: 8.1.0 MySQL Community Server - GPL
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mysql>
mysql> update user set authentication_string='' where user='root';
ERROR 1046 (3D000): No database selected
mysql> update user set authentication_string='' where user='root';
ERROR 1046 (3D000): No database selected
mysql> use mysql;
Database changed
mysql> update user set authentication_string='' where user='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 0
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.01 sec)
mysql>
