--
-- INTERVAL
--
SET DATESTYLE = 'ISO';
-- check acceptance of "time zone style"
SELECT INTERVAL '01:00' AS "One hour";
 One hour 
----------
 01:00
(1 row)

SELECT INTERVAL '+02:00' AS "Two hours";
 Two hours 
-----------
 02:00
(1 row)

SELECT INTERVAL '-08:00' AS "Eight hours";
 Eight hours 
-------------
 -08:00
(1 row)

SELECT INTERVAL '-05' AS "Five hours";
 Five hours 
------------
 -05:00
(1 row)

SELECT INTERVAL '-1 +02:03' AS "22 hours ago...";
 22 hours ago... 
-----------------
 -21:57
(1 row)

SELECT INTERVAL '-1 days +02:03' AS "22 hours ago...";
 22 hours ago... 
-----------------
 -21:57
(1 row)

SELECT INTERVAL '10 years -11 month -12 days +13:14' AS "9 years...";
          9 years...           
-------------------------------
 9 years 1 mon -11 days -10:46
(1 row)

CREATE TABLE INTERVAL_TBL (f1 interval);
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 1 minute');
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 5 hour');
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 10 day');
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 34 year');
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 3 months');
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 14 seconds ago');
INSERT INTO INTERVAL_TBL (f1) VALUES ('1 day 2 hours 3 minutes 4 seconds');
INSERT INTO INTERVAL_TBL (f1) VALUES ('6 years');
INSERT INTO INTERVAL_TBL (f1) VALUES ('5 months');
INSERT INTO INTERVAL_TBL (f1) VALUES ('5 months 12 hours');
-- badly formatted interval
INSERT INTO INTERVAL_TBL (f1) VALUES ('badly formatted interval');
ERROR:  Bad interval external representation 'badly formatted interval'
INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 30 eons ago');
ERROR:  Bad interval external representation '@ 30 eons ago'
-- test interval operators
SELECT '' AS ten, INTERVAL_TBL.*;
 ten |       f1       
-----+----------------
     | 00:01
     | 05:00
     | 10 days
     | 34 years
     | 3 mons
     | -00:00:14
     | 1 day 02:03:04
     | 6 years
     | 5 mons
     | 5 mons 12:00
(10 rows)

SELECT '' AS nine, INTERVAL_TBL.*
   WHERE INTERVAL_TBL.f1 <> interval '@ 10 days';
 nine |       f1       
------+----------------
      | 00:01
      | 05:00
      | 34 years
      | 3 mons
      | -00:00:14
      | 1 day 02:03:04
      | 6 years
      | 5 mons
      | 5 mons 12:00
(9 rows)

SELECT '' AS three, INTERVAL_TBL.*
   WHERE INTERVAL_TBL.f1 <= interval '@ 5 hours';
 three |    f1     
-------+-----------
       | 00:01
       | 05:00
       | -00:00:14
(3 rows)

SELECT '' AS three, INTERVAL_TBL.*
   WHERE INTERVAL_TBL.f1 < interval '@ 1 day';
 three |    f1     
-------+-----------
       | 00:01
       | 05:00
       | -00:00:14
(3 rows)

SELECT '' AS one, INTERVAL_TBL.*
   WHERE INTERVAL_TBL.f1 = interval '@ 34 years';
 one |    f1    
-----+----------
     | 34 years
(1 row)

SELECT '' AS five, INTERVAL_TBL.* 
   WHERE INTERVAL_TBL.f1 >= interval '@ 1 month';
 five |      f1      
------+--------------
      | 34 years
      | 3 mons
      | 6 years
      | 5 mons
      | 5 mons 12:00
(5 rows)

SELECT '' AS nine, INTERVAL_TBL.*
   WHERE INTERVAL_TBL.f1 > interval '@ 3 seconds ago';
 nine |       f1       
------+----------------
      | 00:01
      | 05:00
      | 10 days
      | 34 years
      | 3 mons
      | 1 day 02:03:04
      | 6 years
      | 5 mons
      | 5 mons 12:00
(9 rows)

SELECT '' AS fortyfive, r1.*, r2.*
   FROM INTERVAL_TBL r1, INTERVAL_TBL r2
   WHERE r1.f1 > r2.f1
   ORDER BY r1.f1, r2.f1;
 fortyfive |       f1       |       f1       
-----------+----------------+----------------
           | 00:01          | -00:00:14
           | 05:00          | -00:00:14
           | 05:00          | 00:01
           | 1 day 02:03:04 | -00:00:14
           | 1 day 02:03:04 | 00:01
           | 1 day 02:03:04 | 05:00
           | 10 days        | -00:00:14
           | 10 days        | 00:01
           | 10 days        | 05:00
           | 10 days        | 1 day 02:03:04
           | 3 mons         | -00:00:14
           | 3 mons         | 00:01
           | 3 mons         | 05:00
           | 3 mons         | 1 day 02:03:04
           | 3 mons         | 10 days
           | 5 mons         | -00:00:14
           | 5 mons         | 00:01
           | 5 mons         | 05:00
           | 5 mons         | 1 day 02:03:04
           | 5 mons         | 10 days
           | 5 mons         | 3 mons
           | 5 mons 12:00   | -00:00:14
           | 5 mons 12:00   | 00:01
           | 5 mons 12:00   | 05:00
           | 5 mons 12:00   | 1 day 02:03:04
           | 5 mons 12:00   | 10 days
           | 5 mons 12:00   | 3 mons
           | 5 mons 12:00   | 5 mons
           | 6 years        | -00:00:14
           | 6 years        | 00:01
           | 6 years        | 05:00
           | 6 years        | 1 day 02:03:04
           | 6 years        | 10 days
           | 6 years        | 3 mons
           | 6 years        | 5 mons
           | 6 years        | 5 mons 12:00
           | 34 years       | -00:00:14
           | 34 years       | 00:01
           | 34 years       | 05:00
           | 34 years       | 1 day 02:03:04
           | 34 years       | 10 days
           | 34 years       | 3 mons
           | 34 years       | 5 mons
           | 34 years       | 5 mons 12:00
           | 34 years       | 6 years
(45 rows)

SET DATESTYLE = 'postgres';
SELECT '' AS ten, INTERVAL_TBL.*;
 ten |              f1               
-----+-------------------------------
     | @ 1 min
     | @ 5 hours
     | @ 10 days
     | @ 34 years
     | @ 3 mons
     | @ 14 secs ago
     | @ 1 day 2 hours 3 mins 4 secs
     | @ 6 years
     | @ 5 mons
     | @ 5 mons 12 hours
(10 rows)

-- test avg(interval), which is somewhat fragile since people have been
-- known to change the allowed input syntax for type interval without
-- updating pg_aggregate.agginitval
select avg(f1) from interval_tbl;
                       avg                       
-------------------------------------------------
 @ 4 years 1 mon 10 days 4 hours 18 mins 23 secs
(1 row)