Replace a character from a string

Hi,
how can I replace a particular character from a string on a particular occurrence? Say for eg, if i wan to replace 'a' of second occurrence from 'abcabcabc', then what should i do? I guess the normal REPLACE function replaces every occurrence in a given string. So is there any other way to solve this?
Thanks!

If you are in 9i:
Then you got to split the string into based on the nth position.
SQL> select replace('abddefabc','a','x') from dual;
REPLACE('
xbddefxbc
SQL> select instr('abddefabc','a',2) from dual;
INSTR('ABDDEFABC','A',2)
7
SQL> select substr('abddefabc',1,instr('abddefabc','a',2)-1),substr('abddefabc',instr('abddefabc','a',2)) from dual;
SUBSTR SUB
abddef abc
SQL> select substr('abddefabc',1,instr('abddefabc','a',2)-1),replace(substr('abddefabc',instr('abddefabc','a',2)),'a','X') as replaced from dual;
SUBSTR REP
abddef XbcOfcourse, later on you can join the string..
Jithendra

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