两种MySQL查询用户权限的方法

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)