[root@ver ~]# mysql -h 127.0.0.1 -P 3316 -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.7.17 Source distribution

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mysql>

mysql> show databases;  # 查看所有数据库
+--------------------+
| Database           |
+--------------------+
| information_schema |
| fhgk               |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.01 sec)

mysql> use mysql    # 指定当前操作的数据库
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>

# 创建用户
mysql> CREATE USER ‘username‘@‘host‘ IDENTIFIED BY ‘password‘;

# 删除用户
mysql> DROP USER ‘username‘@‘host‘;

# 用户授权
mysql> grant privileges ON databasename.* TO ‘username‘@‘host‘;

# 创建用户的同时授权
mysql> grant all privileges on databasename.* to ‘username‘@‘host‘ identified by ‘1234‘;

# 授权刷新
mysql> flush privileges;

# 查看用户拥有权限
mysql> show grants for dev@‘%‘;
+----------------------------------------------------------------------+
| Grants for dev@%                                                     |
+----------------------------------------------------------------------+
| GRANT USAGE ON *.* TO ‘dev‘@‘%‘                                      |
| GRANT SELECT, INSERT, UPDATE, DELETE, ALTER ON `fhgk`.* TO ‘dev‘@‘%‘ |
+----------------------------------------------------------------------+
2 rows in set (0.00 sec)

# 撤消用户授权，撤消要求各参数与授权时使用的一致，可以相查看授权再撤消
mysql> revoke privileges ON databasename.* FROM ‘username‘@‘host‘;

privileges参数说明： 
all privileges: 所有权限； 
select: 查询； 
insert: 新增记录; 
update: 更新记录； 
delete: 删除记录； 
create: 创建表； 
drop: 删除表； 
alter: 修改表结构； 
index: 索引相关权限； 
execute: 执行存储过程与call函数 
references： 外键相关； 
create temporary tables：创建临时表； 
lock tables 锁表； 
create view 创建视图； 
show view 查看视图结构； 
create routine 
alter routine: 
event: 
trigger: 触发器相关；

# 修改自己的密码
mysql> set password=password(‘newpassword‘);

# 修改别人密码——方法1
mysql> set password for ‘username‘@‘host‘ = password(‘newpassword‘);

# 修改别人密码——方法2: 适用mysql5.7以前的版本，5.7以后的版本中mysql.user表没有了password字段
mysql> update mysq.user set password=password(‘newpassword‘) where user=‘user‘ and host=‘host‘;
# 修改别人密码——方法3：适用mysql5.7
mysql> update mysql.user set authentication_string=password(‘newpassword‘) where user=‘root‘;

# 修改别人密码——方法4
mysql> alter user ‘test‘@‘%‘ identified by ‘newpassword‘;