CREATE EXTENSION pg_stat_monitor;
SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

SET application_name = 'naeem' ; 
SELECT 1 AS num;
 num 
-----
   1
(1 row)

SET application_name = 'psql' ; 
SELECT 1 AS num;
 num 
-----
   1
(1 row)

SELECT query,application_name FROM pg_stat_monitor ORDER BY query, application_name COLLATE "C";
             query              |          application_name          
--------------------------------+------------------------------------
 SELECT 1 AS num                | naeem
 SELECT 1 AS num                | psql
 SELECT pg_stat_monitor_reset() | pg_regress/application_name_unique
 SET application_name = 'naeem' | naeem
 SET application_name = 'psql'  | psql
(5 rows)

SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

DROP EXTENSION pg_stat_monitor;