Query for Last 4 social

I know it's very simple but i'm missing something here..kindly help.
 I have a query like this :
select SUBSTR (CHAR ((DIGITS (ssn_no))), 1, 9) as ssn_no
from  tb_ssn

which works fine.Now the requirement is to get only the last 4 digits of ssn.So, i tried the following and got an error.

select SUBSTR (CHAR ((DIGITS (ssn_no))), 5, 9) as ssn_no
from  tb_ssn

What am i missing? Please advise.
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select right(SUBSTR (CHAR ((DIGITS (ssn_no))), 1, 9) ,4 ) as ssn_no
from  tb_ssn

select SUBSTR (CHAR ((DIGITS (ssn_no))), 5, 4) as ssn_no
from  tb_ssn

the last parameter indicates the length to cut, not the ending position

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pvsbandiAuthor Commented:
Ha--There it is!! Thanks much!
usually i don't do this,
but may i ask why you graded it with B and not A ?
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