Oracle-L: RE: Implicit Date conversion problem

From: Mercadante, Thomas F <NDATFM_at_labor.state.ny.us>
Date: Tue, 29 Oct 2002 07:34:37 -0800
Message-ID: <F001.004F6485.20021029073437@fatcity.com>

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

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

Sent: Tuesday, October 29, 2002 8:54 AM
To: Multiple recipients of list ORACLE-L

We have a query (please don't ask me why it is written this way)

--Doesn't work:

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'

vs.

--Works:

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 trunc(to_date('20-Dec-02','DD-Mon-YY'))

                     and trunc(to_date('01-Jan-03','DD-Mon-YY'))

Also if we comment "and ea1.est_dt between '20-Dec-02' and '01-Jan-03'" the non-working query runs fine.
Does anyone know what could be wrong? The est_dt is a date column. This is 9201 ...

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!

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Author: Mercadante, Thomas F
INET: NDATFM_at_labor.state.ny.us

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