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From "emmanuel chemla (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-5065) timestampdiff doesn't differentiate between 28 march 2010 and 29 march 2010
Date Wed, 23 Feb 2011 19:01:39 GMT
timestampdiff doesn't differentiate between 28 march 2010 and 29 march 2010
---------------------------------------------------------------------------

                 Key: DERBY-5065
                 URL: https://issues.apache.org/jira/browse/DERBY-5065
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.7.1.1
         Environment: windows 7, the bug has been testified using ij tool and usign squirrel
sql. My locales are "France"
            Reporter: emmanuel chemla


I needed to accomplish a simple task with Derby: computing an interval of days (like datedif
in excel). 

I used the TIMESTAMPDIFF function, it seemed to work well, until I noticed a strange behaviour
: sometimes the computation is OK, sometimes not. 

After having searched the trouble, I've found that from TIMESTAMPDIFF's point of view, the
28 march 2010 is not a different day than the 29 march of 2010. 

You can easily check this with this script in ijtools: 

-- creating testing environment 
connect 'jdbc:derby:MyDbTestxyz;create=true';
CREATE TABLE dummy (beginning DATE, ending DATE); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-04-01', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-31', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-30', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-29', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-28', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-27', '2010-04-01'); 
INSERT INTO dummy (beginning, ending) VALUES ('2010-03-26', '2010-04-01'); 
-- 
-- checking the odd behaviour 
SELECT beginning, ending, {fn timestampdiff(SQL_TSI_DAY, beginning, ending )} AS "interval
in days" FROM dummy; 
-- 
--  cleaning 
DROP TABLE dummy 

You'll get this result : 

beginning	ending	interval in days 
2010-04-01;	2010-04-01;	0 
2010-03-31	;	2010-04-01;	1 
2010-03-30	;	2010-04-01;	2 
2010-03-29	;	2010-04-01;	3   
2010-03-28	;	2010-04-01;	3  ??????
2010-03-27	;	2010-04-01;	4  !
2010-03-26	;	2010-04-01;	5  !


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