QUERY: CREATE TABLE RELTIME_TBL (f1 reltime);
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 1 minute');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 5 hour');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 10 day');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 34 year');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 3 months');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 14 seconds ago');
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('badly formatted reltime');
ERROR:  Bad reltime external representation 'badly formatted reltime'
QUERY: INSERT INTO RELTIME_TBL (f1) VALUES ('@ 30 eons ago');
ERROR:  Bad reltime external representation '@ 30 eons ago'
QUERY: SELECT '' AS six, RELTIME_TBL.*;
six|f1           
---+-------------
   |@ 1 min      
   |@ 5 hours    
   |@ 10 days    
   |@ 34 years   
   |@ 3 mons     
   |@ 14 secs ago
(6 rows)

QUERY: SELECT '' AS five, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 <> '@ 10 days'::reltime;
five|f1           
----+-------------
    |@ 1 min      
    |@ 5 hours    
    |@ 34 years   
    |@ 3 mons     
    |@ 14 secs ago
(5 rows)

QUERY: SELECT '' AS three, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 <= '@ 5 hours'::reltime;
three|f1           
-----+-------------
     |@ 1 min      
     |@ 5 hours    
     |@ 14 secs ago
(3 rows)

QUERY: SELECT '' AS three, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 < '@ 1 day'::reltime;
three|f1           
-----+-------------
     |@ 1 min      
     |@ 5 hours    
     |@ 14 secs ago
(3 rows)

QUERY: SELECT '' AS one, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 = '@ 34 years'::reltime;
one|f1        
---+----------
   |@ 34 years
(1 row)

QUERY: SELECT '' AS two, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 >= '@ 1 month'::reltime;
two|f1        
---+----------
   |@ 34 years
   |@ 3 mons  
(2 rows)

QUERY: SELECT '' AS five, RELTIME_TBL.*
   WHERE RELTIME_TBL.f1 > '@ 3 seconds ago'::reltime;
five|f1        
----+----------
    |@ 1 min   
    |@ 5 hours 
    |@ 10 days 
    |@ 34 years
    |@ 3 mons  
(5 rows)

QUERY: SELECT '' AS fifteen, r1.*, r2.*
   FROM RELTIME_TBL r1, RELTIME_TBL r2
   WHERE r1.f1 > r2.f1
   ORDER BY r1.f1, r2.f1;
fifteen|f1        |f1           
-------+----------+-------------
       |@ 1 min   |@ 14 secs ago
       |@ 5 hours |@ 14 secs ago
       |@ 5 hours |@ 1 min      
       |@ 10 days |@ 14 secs ago
       |@ 10 days |@ 1 min      
       |@ 10 days |@ 5 hours    
       |@ 3 mons  |@ 14 secs ago
       |@ 3 mons  |@ 1 min      
       |@ 3 mons  |@ 5 hours    
       |@ 3 mons  |@ 10 days    
       |@ 34 years|@ 14 secs ago
       |@ 34 years|@ 1 min      
       |@ 34 years|@ 5 hours    
       |@ 34 years|@ 10 days    
       |@ 34 years|@ 3 mons     
(15 rows)