mysql 里对root及普通用户赋权及更改密码的一些命令

让root用户可以通用 Navicat for MySQL客户端登录：

mysql> grant all privileges on *.* to root@'%' identified by 'root';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

对user1用户更改密码，权限有点大，但不执行下面的第一条命令，密码改不了。
mysql> grant all privileges on *.* to user1@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

mysql> set password for user1@localhost=password('123456');
Query OK, 0 rows affected (0.00 sec)

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