MySql五个授权表的功能

mysql.user

select host,user,password from mysql.user; grant all privileges on *.* to monty@localhost identified by '123456' with grant option; select host,user,password from mysql.user;display:+-----------+------+-------------------------------------------+ | host | user | password | +-----------+------+-------------------------------------------+ | localhost | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 | +-----------+------+-------------------------------------------+ 1 row in set (0.00 sec) Query OK, 0 rows affected (0.01 sec) +-----------+-------+-------------------------------------------+ | host | user | password | +-----------+-------+-------------------------------------------+ | localhost | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 | | localhost | monty | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | +-----------+-------+-------------------------------------------+ 2 rows in set (0.00 sec) mysql.db

drop user monty@localhost;
select host,db,user from mysql.db;
grant all privileges on test.* to monty@localhost identified 

by '123456' with grant option;
select host,user,db from mysql.db;

display:

Query OK, 0 rows affected (0.00 sec)Empty set (0.00 sec)Query OK, 0 rows affected (0.00 sec)+-----------+-------+------+| host | user | db |+-----------+-------+------+| localhost | monty | test |+-----------+-------+------+1 row in set (0.00 sec)

mysql.host\

#未测试

mysql.tables_priv

select * from tables_priv; grant all privileges on test.student to monty@localhost identified by '123456' with grant option; select host,db,table_name,user from tables_priv; drop user monty@localhost;
display:

Empty set (0.00 sec)


Query OK, 0 rows affected (0.00 sec)


+-----------+------+------------+-------+
| host | db | table_name | user |
+-----------+------+------------+-------+
| localhost | test | student | monty |
+-----------+------+------------+-------+
1 row in set (0.00 sec)


Query OK, 0 rows affected (0.00 sec)

mysql.columns_priv

select * from columns_priv; grant select(sno) on test.student to monty@localhost identified by '123456' with grant option; select host,db,user,table_name,column_name,column_priv from columns_priv; drop user monty@localhost;display：

Empty set (0.00 sec)


Query OK, 0 rows affected (0.00 sec)


+-----------+------+-------+------------+-------------+-------------+
| host | db | user | table_name | column_name | column_priv |
+-----------+------+-------+------------+-------------+-------------+
| localhost | test | monty | student | sno | Select |
+-----------+------+-------+------------+-------------+-------------+
1 row in set (0.00 sec)


Query OK, 0 rows affected (0.00 sec)