Query returning record even when not satisfying the where condition

Question

Hi,
Below Query is returning value '1D' though it doesnt fall under the range '01' and '99'.
I actually want to get the last 2 characters of the string and filter out if its not a number. Please help me.
select * from (
select substr('qwe1D',4) val from dual )
where val between '01' and '99';
Thanks
Madhuri

Answer 1

Sven W. wrote:
Madhuri wrote:
Hi,
Below Query is returning value '1D' though it doesnt fall under the range '01' and '99'.
I actually want to get the last 2 characters of the string and filter out if its not a number. Please help me.
select * from (
select substr('qwe1D',4) val from dual )
where val between '01' and '99';
Thanks
MadhuriBut '1D' is between '01' and '99'. Simply because '1' is between '0' and '9'.
One more example: '1111111' is also between '01' and '99'. This is how an string comparison works.
To filter out strings that do not have numeric chars in them you can use several functions. regexp_substr/regexp_replace/translate/regexp_like etc.
This might work:
select * from (
select substr('qwe1D',4) val from dual )
where regexp_like(val,'\d{2}$');Edited by: Sven W. on Sep 27, 2012 12:35 PMThere is still one problem with this. It will return '00' which is not part of the original requirement. You have to add
AND val != '00'