Oracle-L: RE: TO

From: kkennedy <kkennedy_at_firstpoint.com>
Date: Fri, 28 Jun 2002 11:31:03 -0800
Message-ID: <F001.0048BBD2.20020628113103@fatcity.com>

I've run into this behavior before but at the moment, I can't remember how I worked around it. I remember the workaround was not elegant.

The problem is that the optimizer merges the where clause from the query with the where clause from the view then does a full table scan. Since it is checking both conditions against every row, it fails as soon as it tries the to_number conversion on one of the non-numeric rows.

I tried to reproduce the problem on an 8.1.7.2 database but my test did not fail -- maybe Oracle changed this behavior somewhere along the way.

As a workaround, maybe you could try something like:

SELECT MSC_S_C
FROM (SELECT TO_NUMBER(MSC_SERVICE_CODE) MSC_S_C FROM msc_view) WHERE MSC_S_C Between 1000 and 2000

Kevin Kennedy
First Point Energy Corporation

-----Original Message-----
Sent: Friday, June 28, 2002 11:05 AM
To: Multiple recipients of list ORACLE-L

LIST, I have a view like this:

CREATE OR REPLACE VIEW MSC_VIEW ( MSC_SERVICE_CODE, MSC_MTF_SERVICE_ID ) AS select MSC_SERVICE_CODE,MSC_MTF_SERVICE_ID

   				      from MTF_SERVICE_CODE_MSC 
                	  	      where 
       				  substr(MSC_SERVICE_CODE, 1, 1) in

('9','8','7','6','5','4','3','2','1','0')

when I run this query --->>
SELECT TO_NUMBER(MSC_SERVICE_CODE) FROM msc_view it works fine BUT When I run the following query I get Invalid number(ORA-01722).

SELECT TO_NUMBER(MSC_SERVICE_CODE) FROM msc_view WHERE TO_NUMBER(MSC_SERVICE_CODE) Between 1000 and 2000

Don't undersatnd why TO_NUMBER doesn't work under WHERE clause! Any Idea I realy Appreciate.
Thanks for Your time and Help.

Hamid Alavi
Office 818 737-0526
Cell 818 402-1987

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Author: Hamid Alavi
INET: hamid.alavi_at_quovadx.com

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Author: kkennedy
INET: kkennedy_at_firstpoint.com

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RE: TO_NUMBER