#创建用户
create user 'egon'@'1.1.1.1' identified by '123';
create user 'egon'@'192.168.1.%' identified by '123';
create user 'egon'@'%' identified by '123';#授权：对文件夹，对文件，对文件某一字段的权限
查看帮助：help grant
常用权限有：select,update,alter,delete
all可以代表除了grant之外的所有权限#针对所有库的授权:*.*
grant select on *.* to 'egon1'@'localhost' identified by '123'; #只在user表中可以查到egon1用户的select权限被设置为Y#针对某一数据库：db1.*
grant select on db1.* to 'egon2'@'%' identified by '123'; #只在db表中可以查到egon2用户的select权限被设置为Y#针对某一个表：db1.t1
grant select on db1.t1 to 'egon3'@'%' identified by '123';  #只在tables_priv表中可以查到egon3用户的select权限#针对某一个字段：
mysql> select * from t3;
+------+-------+------+
| id   | name  | age  |
+------+-------+------+
|    1 | egon1 |   18 |
|    2 | egon2 |   19 |
|    3 | egon3 |   29 |
+------+-------+------+grant select (id,name),update (age) on db1.t3 to 'egon4'@'localhost' identified by '123';
#可以在tables_priv和columns_priv中看到相应的权限
mysql> select * from tables_priv where user='egon4'\G
*************************** 1. row ***************************Host: localhostDb: db1User: egon4Table_name: t3Grantor: root@localhostTimestamp: 0000-00-00 00:00:00Table_priv:
Column_priv: Select,Update
row in set (0.00 sec)mysql> select * from columns_priv where user='egon4'\G
*************************** 1. row ***************************Host: localhostDb: db1User: egon4Table_name: t3
Column_name: idTimestamp: 0000-00-00 00:00:00
Column_priv: Select
*************************** 2. row ***************************Host: localhostDb: db1User: egon4Table_name: t3
Column_name: nameTimestamp: 0000-00-00 00:00:00
Column_priv: Select
*************************** 3. row ***************************Host: localhostDb: db1User: egon4Table_name: t3
Column_name: ageTimestamp: 0000-00-00 00:00:00
Column_priv: Update
rows in set (0.00 sec)#删除权限
revoke select on db1.* from 'egon'@'%';