Well,
Let me point out one thing .... following is the original query ...
-- this returns no rows ...
select ea1.ep_number, ea1.est_dt, veas.est_dt
from (select a.ep_number, ea.est_dt
from v_episode_avail_summary_break a, episode_airings ea
where a.ep_number = ea.ep_number
and ea.est_dt between '20-Dec-02' and '01-Jan-03'
group by a.ep_number, ea.est_dt) veas,
episode_airings ea1
where veas.ep_number = ea1.ep_number
and ea1.est_dt between '20-Dec-02' and '01-Jan-03'
-- This DOES work ... returns all the right rows
select ea1.ep_number, ea1.est_dt, veas.est_dt
from (select a.ep_number, ea.est_dt
from v_episode_avail_summary_break a, episode_airings ea
where a.ep_number = ea.ep_number
and ea.est_dt between '20-Dec-02' and '01-Jan-03'
group by a.ep_number, ea.est_dt) veas,
episode_airings ea1
where veas.ep_number = ea1.ep_number
-- and ea1.est_dt between '20-Dec-02' and '01-Jan-03'
Point to consider is that the "commented out where clause" is the same as the one used in the from clause query ... then why does it fail?
Tom: according to Oracle, when comparing a varchar2 to a date column, the string does get converted to a date ...
The reason i am asking this I have to explain the developers on why this isn't working. They agree that explicit datatype conversion is a good idea but their managers want to know why ??
(yeah ... sure go ahead pity me ...)
Raj
______________________________________________________
Rajendra Jamadagni MIS, ESPN Inc.
Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.
QOTD: Any clod can have facts, but having an opinion is an art!
-----Original Message-----
From: Mercadante, Thomas F [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 29, 2002 10:35 AM
To: '[EMAIL PROTECTED]'
Cc: Jamadagni, Rajendra
Subject: RE: Implicit Date conversion problem
Raj,
you are forgetting how dates are stored internally vs. how they are displayed by sqlplus.
change your first query to:
select ea1.ep_number, ea1.est_dt, veas.est_dt
from (select a.ep_number, ea.est_dt
from v_episode_avail_summary_break a, episode_airings ea
where a.ep_number = ea.ep_number
and ea.est_dt between to_date('20-Dec-2002','dd-mon-yyyy') and to_date('01-Jan-2003' ,'dd-mon-yyyy')
group by a.ep_number, ea.est_dt) veas,
episode_airings ea1
where veas.ep_number = ea1.ep_number
and ea1.est_dt between between to_date('20-Dec-2002','dd-mon-yyyy') and to_date('01-Jan-2003' ,'dd-mon-yyyy')
Your selection was not working properly because you ended up comparing string values with string values.
example: 21-Dec-2002 is not between 20-Dec-2002 and 01-Jan-2003 using string comparison
(21 is greater than 20 and 01 both).
hope this helps.
Tom Mercadante
Oracle Certified Professional
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