Summary of methods for querying MySQL user permissions

mysql> show grants for username@localhost;

+---------------------------------------------------------------------+

| Grants for root@localhost |

+---------------------------------------------------------------------+

| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |

+---------------------------------------------------------------------+

mysql> select * from mysql.user where user='root' and host='localhost' \G;
*************************** 1. row ***************************
Host: localhost
User: root
Password: **********************
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Reload_priv: Y
Shutdown_priv: Y
Process_priv: Y
File_priv: Y
Grant_priv: Y
References_priv: Y
Index_priv: Y
Alter_priv: Y
Show_db_priv: Y
Super_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Execute_priv: Y
Repl_slave_priv: Y
Repl_client_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Create_user_priv: Y
Event_priv: Y
Trigger_priv: Y
Create_tablespace_priv: Y
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin:mysql_native_password
authentication_string:
password_expired: N
1 row in set (0.01 sec)

mysql> drop user test;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> grant all on MyDB.kkk to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> 
mysql> show grants for test;
+---------------------------------------------------------------------------------------------------------------------+
| Grants for test@% |
+---------------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT ALL PRIVILEGES ON `MyDB`.`kkk` TO 'test'@'%' |
+---------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> select * from mysql.tables_priv\G;
*************************** 1. row ***************************
Host: %
Db: MyDB
User: test
Table_name: kkk
Grantor: root@localhost
Timestamp: 0000-00-00 00:00:00
Table_priv: Select,Insert,Update,Delete,Create,Drop,References,Index,Alter,Create View,Show view,Trigger
Column_priv: 
1 row in set (0.01 sec)
ERROR: 
No query specified
mysql> <br>

mysql> drop user test;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> grant select (id, col1) on MyDB.TEST1 to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> 
mysql> select * from mysql.columns_priv;
+------+------+------+------------+-------------+---------------------+-------------+
| Host | Db | User | Table_name | Column_name | Timestamp | Column_priv |
+------+------+------+------------+-------------+---------------------+-------------+
| % | MyDB | test | TEST1 | id | 0000-00-00 00:00:00 | Select |
| % | MyDB | test | TEST1 | col1 | 0000-00-00 00:00:00 | Select |
+------+------+------+------------+-------------+---------------------+-------------+
2 rows in set (0.00 sec)
mysql> show grants for test;
+---------------------------------------------------------------------------------------------------------------------+
| Grants for test@% |
+---------------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT SELECT (id, col1) ON `MyDB`.`TEST1` TO 'test'@'%' |
+---------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> <br>