BEGIN;
CREATE EXTENSION country;
SELECT country_name(NULL),country_common_name(NULL);
 country_name | country_common_name 
--------------+---------------------
              | 
(1 row)

SELECT country_name('bn'),country_common_name('bn');
   country_name    | country_common_name 
-------------------+---------------------
 Brunei Darussalam | Brunei
(1 row)

SELECT country_name('bo'),country_common_name('bo');
           country_name           | country_common_name 
----------------------------------+---------------------
 Bolivia (Plurinational State of) | Bolivia
(1 row)

SELECT country_name('ci'),country_common_name('ci');
 country_name  | country_common_name 
---------------+---------------------
 Côte d'Ivoire | Ivory Coast
(1 row)

SELECT country_name('fk'),country_common_name('fk');
           country_name            | country_common_name 
-----------------------------------+---------------------
 Falkland Islands (the) [Malvinas] | Falkland Islands
(1 row)

SELECT country_name('gb'),country_common_name('gb');
                     country_name                     | country_common_name 
------------------------------------------------------+---------------------
 United Kingdom of Great Britain and Northern Ireland | Great Britain
(1 row)

SELECT country_name('ir'),country_common_name('ir');
        country_name        | country_common_name 
----------------------------+---------------------
 Iran (Islamic Republic of) | Iran
(1 row)

SELECT country_name('kp'),country_common_name('kp');
                country_name                 | country_common_name 
---------------------------------------------+---------------------
 Korea (the Democratic People's Republic of) | North Korea
(1 row)

SELECT country_name('kr'),country_common_name('kr');
      country_name       | country_common_name 
-------------------------+---------------------
 Korea (the Republic of) | South Korea
(1 row)

SELECT country_name('la'),country_common_name('la');
           country_name           | country_common_name 
----------------------------------+---------------------
 Lao People's Democratic Republic | Laos
(1 row)

SELECT country_name('md'),country_common_name('md');
       country_name        | country_common_name 
---------------------------+---------------------
 Moldova (the Republic of) | Moldova
(1 row)

SELECT country_name('ru'),country_common_name('ru');
    country_name    | country_common_name 
--------------------+---------------------
 Russian Federation | Russia
(1 row)

SELECT country_name('sy'),country_common_name('sy');
     country_name     | country_common_name 
----------------------+---------------------
 Syrian Arab Republic | Syria
(1 row)

SELECT country_name('tw'),country_common_name('tw');
        country_name        | country_common_name 
----------------------------+---------------------
 Taiwan (Province of China) | Taiwan
(1 row)

SELECT country_name('tz'),country_common_name('tz');
         country_name         | country_common_name 
------------------------------+---------------------
 Tanzania, United Republic of | Tanzania
(1 row)

SELECT country_name('uk'),country_common_name('uk');
                     country_name                     | country_common_name 
------------------------------------------------------+---------------------
 United Kingdom of Great Britain and Northern Ireland | Great Britain
(1 row)

SELECT country_name('ve'),country_common_name('ve');
            country_name            | country_common_name 
------------------------------------+---------------------
 Venezuela (Bolivarian Republic of) | Venezuela
(1 row)

ROLLBACK;