RE: Strange behavior

From: Bobak, Mark <Mark.Bobak_at_il.proquest.com>
Date: Wed, 07 Jan 2004 12:09:26 -0800
Message-ID: <F001.005DC01C.20040107120926@fatcity.com>

Stephen,

Do any of your sub-selects (the queries inside the IN() clause) return NULL? If so, that will definitely cause zero rows to be returned by the outer query.

-Mark

Mark J. Bobak
Oracle DBA
ProQuest Company
Ann Arbor, MI
"Imagination was given to man to compensate him for what he is not, and a sense of humor was provided to console him for what he is." --Unknown

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

Sent: Wednesday, January 07, 2004 2:49 PM To: Multiple recipients of list ORACLE-L

Greetings fellow-DBA-folk:

When I run several queries, I am getting very strange results. Selecting * from apple returns the expected data records, but count(*) does not.
Selecting anything other than * from apple says no records. The subquery for pear works fine on it's own. Selecting anything other than * from apple returns the expected records when about 900+ values are placed literally in the subquery as shown in example 4 below.

Am I missing something? Anyone have a direction for me to look for the cause of this?

Thanks
Stephen

EX 1
select rowid from common.apple
where appleinter1 in (select pearinternal from common.pear where pear_clnt_src_cd = 'CCN')
and appletermd is null
and rownum < 10 ;

no rows selected

EX 2
select rownum from common.apple
where appleinter1 in (select pearinternal from common.pear where pear_clnt_src_cd = 'CCN')
and appletermd is null
and rownum < 10 ;

no rows selected

EX 3
select * from common.apple
where appleinter1 in (select pearinternal from common.pear where pear_clnt_src_cd = 'CCN')
and appletermd is null
and rownum < 10 ;

9 rows returned, I removed them for confidentiality reasons ---

EX 4
select count(*) from common.apple
where appleinter1 in ( 7009 , 7010 , 7011 , 7012 , 7013 , 7014 , 7015 , 7016 , 7017 , 7018 , 7019)
and appletermd is null
and rownum < 10 ;

9 rows returned, I removed them for confidentiality reasons ---

EX 5
select count(*) from common.apple
where appleinter1 in (select pearinternal from common.pear where pear_clnt_src_cd = 'CCN')
and appletermd is null;

COUNT(*)

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Author: Stephen Andert
INET: StephenAndert_at_firsthealth.com

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Author: Bobak, Mark
INET: Mark.Bobak_at_il.proquest.com

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