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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Create view using CAST to change datatype
Well,
the first problem you have is that you obviously have a character value stored in that column. This is causing the ORA-01722 - invalid number error. This means that you will not be able to do this using just a view. If you still need to do this, you will need to create a function to attempt to convert the value to a number and trap the error. Something like:
Create or replace function convert_it(in_str in varchar2) return number is
begin
return to_number(nvl(rtrim(in_str,' '),0));
exception
when others then
return '';
end;
/
CREATE OR REPLACE VIEW tomview
AS
SELECT
col1, col2,
convert_it(col1) col1_numb
FROM tomtest
/
This will get rid of the ORA-1722 error, as it will return a null value for all non-numeric columns.
As for the ORA-1002 error, I', not sure how you get that - I would fix the first one first and then see about the secnd one.
good luck
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
From: Saira Somani-Mendelin [mailto:saira_somani_at_yahoo.com]
Sent: Friday, March 19, 2004 10:41 AM
To: oracle-l_at_freelists.org
Subject: RE: Create view using CAST to change datatype
I should also mention that along with the ORA-01722 error, I am also receiving the ORA-01002: Fetch out of sequence error.
FYI, we are using version 8.1.7.4 and I am using TOAD on w2k pro.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Saira
Somani-Mendelin
Sent: March 19, 2004 10:35 AM
To: oracle-l_at_freelists.org
Subject: RE: Create view using CAST to change datatype
I'm not sure why I'm leaning towards CAST...(I claim ignorance!)
In any case, I tried methods, both yours and Igor's, and received the same error:
ORA-01722: invalid number
Somewhere in this table, there is a strange value. I was trying to make life simpler without having to create multiple views to deal with these data value issues (filter the view by some criteria).
So here's another question (just out of curiosity), how can I determine which value is causing me problems?
Thanks for all your help so far! I appreciate the time. Saira
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mercadante, Thomas F
Sent: March 19, 2004 10:10 AM
To: 'oracle-l_at_freelists.org'
Subject: RE: Create view using CAST to change datatype
Saira,
This worked:
CREATE OR REPLACE VIEW tomview
AS
SELECT
col1, col2,
cast(NVL(RTRIM(col1),0) AS NUMBER) col1_numb
FROM tomtest
Values for the TOMTEST table were (' ',1);
SELECT * FROM tomview
returns
values of (' ', 1, 0)
And I agree wih Igor - why are you using CAST rather than to_number?
Tom Mercadante
Oracle Certified Professional
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.htmlput 'unsubscribe' in the subject line.
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