RE: Problem with joining char field to varchar2 field

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Wed, 5 May 2004 09:49:29 -0400
Message-ID: <000301c432a7$c98ffac0$0704a8c0@development.perceptron.com>

Just checked 8.1.5 on NT and 10g on XP.
In both cases default setting for "blank_trimming" is FALSE. But, it could be different in Warren's installation.

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 Goulet, Dick Sent: Wednesday, May 05, 2004 8:35 AM
To: oracle-l_at_freelists.org
Subject: RE: Problem with joining char field to varchar2 field

Warren,

There is a structural difference between a varchar and char datatypes. =
Char's will get padded to the full size of the field whereas Varchar's = won't. To explain the differences in Windoze vs. AIX check the init = file to see if BLANK_TRIMMING is true. Something in the past tells me = that the default on Windoze is true and Unix is false.

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA

-----Original Message-----
From: Warren Homer [mailto:wazhomer_at_hotmail.com] Sent: Tuesday, May 04, 2004 8:51 PM
To: oracle-l_at_freelists.org
Subject: Problem with joining char field to varchar2 field=20

Hi all,

we are currently running Oracle 9.2.0.1.0 on AIX 4.3.

I am trying to join two tables on a varchar2(50) field and a CHAR(30) = field=20
where both are defined as NOT NULL. Although these two fields have the = same=20
value inserted Oracle interprets these two columns to be NOT equal. I = have=20
tried the same SQL test on a Window 2000 Oracle 9.2.0.3.0 environment=20 without any problems. Is this a bug in Oracle 9201 or a problem with AIX =
?=20
Thanks in advance for any help.

The following shows the process I have used to create the problem.

CREATE TABLE PTMBT01
(COL1_ID NUMBER(10) NOT NULL

  , COL2                CHAR(30)        NOT NULL

)
TABLESPACE PSMBT01_00
PCTFREE 5
PCTUSED 75; CREATE TABLE PTMBT02
(COL1_ID NUMBER(10) NOT NULL

  , COL2                VARCHAR2(50)    NOT NULL

)
TABLESPACE PSMBT02_00
PCTFREE 5
PCTUSED 75; INSERT INTO PTMBT01 VALUES(1,'111');
INSERT INTO PTMBT01 VALUES(2,'123'); INSERT INTO PTMBT02 VALUES(1,'123');
INSERT INTO PTMBT02 VALUES(2,'123'); the following SQL returns NO rows. However, it does return two rows (as=20
expected) when run in the Windows 2000 Oracle 9.2.0.3.0 environment.

SELECT *
FROM PTMBT01 T01
, PTMBT02 T02
WHERE T01.COL2 =3D T02.COL2; Thanks in advance,
Warren.

Mother's Day is May 9. Make it special with great ideas from the = Mother's=20
Day Guide! http://special.msn.com/network/04mothersday.armx

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Received on Wed May 05 2004 - 08:46:34 CDT