Handling EXCEPTION in SQL query itself

Hi friends,
I have situation like the following:
SELECT CASE WHEN ('1') > 0 THEN 'Y'
ELSE 'N'
END
FROM dual;
For this query, Oracle returns 'Y'. That's OK. Somtimes instead of '1' some string may come ('1a' or 'gf'). In such cases Oracle returns 'invalid number' exception. As per my requirement, in such cases, 'N' should be returned.
Is it possible to perform this in SQL (without going to PLSQL)?
Thanks in advance.

"case-when" statements are evaluated in order.
so you must do something like this:
SELECT
CASE WHEN <is not number>THEN 'N'
CASE WHEN <is greater than 0>THEN 'Y'
Now "<is greater than 0>" will always have number for input, can't get "not number" error there.
See this thread:
Re: regular expression: integer is between N..M
Edited by: CharlesRoos on May 27, 2010 5:03 AM

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"case-when" statements are evaluated in order.
so you must do something like this:
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Handling EXCEPTION in SQL query itself

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