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RE: Wrong results from date comaprisons

From: Vlado Barun <vlado_at_cadre5.com>
Date: Tue, 24 May 2005 13:06:52 -0400
Message-Id: <200505241706.j4OH6w694100@cadre5.com> 





Please provide the structure of the table...



Vlado Barun, M.Sc.


Senior Data Architect, Cadre5


www.cadre5.com

Office: 865 690 4442
Mobile: 865 335 7652
e-mail: vlado_at_cadre5.com




AIM: vbarun2



-----Original Message-----



From: Ken Naim [mailto:kennaim_at_gmail.com] 
Sent: Tuesday, May 24, 2005 12:40 PM


To: 'Igor Neyman'; 'Vlado Barun'; oracle-l_at_freelists.org
Subject: RE: Wrong results from date comaprisons



You are correct, the statement I pasted was the first one I ran but then
realized there could be a century difference so I reran it using the full
year. The data was from the second statement pasted below.



select to_char(agy_hist_eff_dt,'DD-Mon-YYYY HH24:mi:ss')
s,to_char(agy_hist_end_dt,'DD-Mon-YYYY HH24:mi:ss') e,
agy_hist_end_dt-agy_hist_eff_dt d from agency_history a where
agy_hist_void_ind='y' 


and agy_hist_eff_dt!=agy_hist_end_dt



-----Original Message-----



From: Igor Neyman [mailto:ineyman_at_perceptron.com] 
Sent: Tuesday, May 24, 2005 11:07 AM


To: kennaim_at_gmail.com; 'Vlado Barun'; oracle-l_at_freelists.org
Subject: RE: Wrong results from date comaprisons



Are you sure, that you are showing the exact statement you are running, or
that your output produced by the statement you showed?



to_char(agy_hist_eff_dt,'DD-Mon-YY HH24:mi:ss') should return something
like:



01-Jan-04 00:00:00



and not:



01-Jan-2004 00:00:00



as shown in your output.



Igor Neyman, OCP DBA


ineyman_at_perceptron.com





-----Original Message-----



From: oracle-l-bounce_at_freelists.org


[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ken Naim
Sent: Tuesday, May 24, 2005 10:47 AM


To: 'Vlado Barun'; oracle-l_at_freelists.org
Subject: RE: Wrong results from date comaprisons



The fields are date fields so AFAIK it cannot be any more precise. Also if
that were the case the diff should return some tiny fraction 



-----Original Message-----



From: Vlado Barun [mailto:vlado_at_cadre5.com]
Sent: Tuesday, May 24, 2005 10:38 AM


To: kennaim_at_gmail.com; oracle-l_at_freelists.org
Subject: RE: Wrong results from date comaprisons



Depends on how precise the date columns are... Are you going down to the
milliseconds? Your output only goes to the second...




Vlado Barun, M.Sc.


Senior Data Architect, Cadre5


www.cadre5.com

Office: 865 690 4442
Mobile: 865 335 7652
e-mail: vlado_at_cadre5.com




AIM: vbarun2


-----Original Message-----



From: oracle-l-bounce_at_freelists.org


[mailto:oracle-l-bounce_at_freelists.org]


On Behalf Of Ken Naim


Sent: Tuesday, May 24, 2005 11:31 AM


To: oracle-l_at_freelists.org


Subject: Wrong results from date comaprisons



Has anyone experienced this with 10g (10.1.0.4.0)? I am getting wrong
results from the following query. The start and end dates are equal yet,
they are returned by the query and the difference column shows again that
they should be equal although there are many rows that are filtered
correctly. There aren't any indexes on the fields in questions and there is
a constraint on the start date field




select to_char(agy_hist_eff_dt,'DD-Mon-YY HH24:mi:ss')
s,to_char(agy_hist_end_dt,'DD-Mon-YY HH24:mi:ss') e,
agy_hist_end_dt-agy_hist_eff_dt d from agency_history a where
agy_hist_void_ind='y' 


and agy_hist_eff_dt!=agy_hist_end_dt



S				E				D
01-Jan-2004 00:00:00	01-Jan-2004 00:00:00	0
13-Oct-2003 00:00:00	13-Oct-2003 00:00:00	0
13-Jul-2004 00:00:00	13-Jul-2004 00:00:00	0
21-Oct-2004 00:00:00	21-Oct-2004 00:00:00	0
01-Jan-2005 00:00:00	01-Jan-2005 00:00:00	0
01-Jan-2004 00:00:00	01-Jan-2004 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
22-Jul-1999 00:00:00	22-Jul-1999 00:00:00	0
05-Jan-1998 00:00:00	05-Jan-1998 00:00:00	0
01-Jan-2004 00:00:00	01-Jan-2004 00:00:00	0
07-Jan-2004 00:00:00	07-Jan-2004 00:00:00	0
10-Jun-2004 00:00:00	10-Jun-2004 00:00:00	0
09-Jun-2004 00:00:00	09-Jun-2004 00:00:00	0
09-Nov-2004 00:00:00	09-Nov-2004 00:00:00	0
01-Jan-2005 00:00:00	01-Jan-2005 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
01-Jan-2005 00:00:00	01-Jan-2005 00:00:00	0
28-Jun-2002 00:00:00	28-Jun-2002 00:00:00	0
01-Jun-2001 00:00:00	01-Jun-2001 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
03-Apr-2000 00:00:00	03-Apr-2000 00:00:00	0
01-Apr-1999 00:00:00	01-Apr-1999 00:00:00	0
28-May-2002 00:00:00	28-May-2002 00:00:00	0
01-Apr-1999 00:00:00	01-Apr-1999 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
05-Jan-1998 00:00:00	05-Jan-1998 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
01-Jun-2001 00:00:00	01-Jun-2001 00:00:00	0
03-Apr-2000 00:00:00	03-Apr-2000 00:00:00	0
01-Jun-2001 00:00:00	01-Jun-2001 00:00:00	0
01-Jun-2001 00:00:00	01-Jun-2001 00:00:00	0
28-Jun-2002 00:00:00	28-Jun-2002 00:00:00	0
01-Jan-2003 00:00:00	01-Jan-2003 00:00:00	0
22-Jun-1999 00:00:00	22-Jun-1999 00:00:00	0
02-Jul-1999 00:00:00	02-Jul-1999 00:00:00	0
18-Apr-2000 00:00:00	18-Apr-2000 00:00:00	0





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Received on Tue May 24 2005 - 13:11:44 CDT












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