初始库2/4 - mysql - 详解

mysql作用介绍：

mysql：这个是mysql的核心数据库，类似于sql

server中的master表，主要负责存储数据库的用户、权限设置、关键字等mysql自己需要使用的控制和管理信息。
不可以删除
如果对mysql不是很了解，也不要轻易修改这个数据库里面的表信息。

列名	数据类型	是否为空	key	默认值	extra额外的
`Host`	`char(255)`	`NO`	`PRI`	``	``
`User`	`char(32)`	`NO`	`PRI`	``	``
`Select_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Insert_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Update_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Delete_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Drop_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Reload_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Shutdown_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Process_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`File_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Grant_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`References_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Index_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Alter_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Show_db_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Super_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_tmp_table_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Lock_tables_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Execute_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Repl_slave_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Repl_client_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_view_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Show_view_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_routine_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Alter_routine_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_user_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Event_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Trigger_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_tablespace_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`ssl_type`	`enum(''\'ANY'\'X509'\'SPECIFIED')`	`NO`	``	``	``
`ssl_cipher`	`blob`	`NO`	``	NULL	‘’
`x509_issuer`	`blob`	`NO`	``	NULL	‘’
`x509_subject`	`blob`	`NO`	``	NULL	‘’
`max_questions`	`int unsigned`	`NO`	``	`0`	``
`max_updates`	`int unsigned`	`NO`	``	`0`	``
`max_connections`	`int unsigned`	`NO`	``	`0`	``
`max_user_connections`	`int unsigned`	`NO`	``	`0`	``
`plugin`	`char(64)`	`NO`	``	`caching_sha2_password`	``
`authentication_string`	`text`	`YES`	``	NULL	‘’
`password_expired`	`enum('N'\'Y')`	`NO`	``	`N`	``
`password_last_changed`	`timestamp`	`YES`	``	NULL	‘’
`password_lifetime`	`smallint unsigned`	`YES`	``	NULL	‘’
`account_locked`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Create_role_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Drop_role_priv`	`enum('N'\'Y')`	`NO`	``	`N`	``
`Password_reuse_history`	`smallint unsigned`	`YES`	``	NULL	‘’
`Password_reuse_time`	`smallint unsigned`	`YES`	``	NULL	‘’
`Password_require_current`	`enum('N'\'Y')`	`YES`	``	NULL	‘’
`User_attributes`	`json`	`YES`	``	NULL	‘’

用户、权限设置、关键字

mysql>  use mysql;
mysql>  select host,user,plugin  from user;
mysql>  select host,user,plugin,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv from user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| %         | root          |
| localhost | mysql.session |
| localhost | mysql.sys     |
| localhost | root          |
+-----------+---------------+
mysql> delete from user where host="%";
mysql> flush priviledges;                          刷新权限

%随便看
创建用户、授权、设置与更改用户密码、撤销用户权限、删除用户

最大权限
GRANT ALL PRIVILEGES ON *.* TO "myuser"@"%"IDENTIFIED BY "mypassword" WITH GRANT OPTION;