ERROR 1045 (28000): Access denied for user 'mysql'@'localhost' (using password: YES

解决方法：

利用mysql安装时的默认用户名登录mysql后， 输入以下命令修改root密码

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass'; 

2. 授予用户权限 

GRANT ALL PRIVILEGES ON *.* TO 'jiang'@'%' IDENTIFIED BY '1';

flush privileges;

下面的内容没有用到

一.有时可以直接输入命令: mysql进入数据库

启动数据库：# mysqld_safe &

二.查看用户命令: 

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select host,user from mysql.user;//show databases;

+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+

4 rows in set (0.00 sec)

mysql> 

 删除用户

 　　

mysql>Delete FROM user Where User='test' and Host='localhost';

 　　mysql>flush privileges;

 　　mysql>drop database testDB; //删除用户的数据库

删除账户及权限：>drop user 用户名@'%';

　　　　　　　　>drop user 用户名@ localhost;

创建用户

mysql> create user 'root'@'%' identified by '1';#  %代表所有端口
Query OK, 0 rows affected (0.07 sec)

mysql> select host,user from mysql.user;
+-----------+------------------+
| host      | user             |
+-----------+------------------+
| %         | root             |
| %         | usrabc           |
| localhost | mysql.infoschema |
| localhost | mysql.session    |
| localhost | mysql.sys        |
+-----------+------------------+
5 rows in set (0.00 sec)

查看数据库列表：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
+--------------------+
1 row in set (0.00 sec)

mysql>