Sequence Question

How do I create a sequence that gives me alpha numeric values. (can we do this?)

Thanks in Advance.

select
chr( mod(test_seq.nextval, ascii('z')-ascii(A) )+ascii(A) )
from dual

a sequence always gives a numeric value only. But when you are inserting values, you may concatenate this number with some alphabets and insert a alphanumeric string.