SQL & PL/SQL

Hello,

i am writing a function to mask Account numbers and SSN to give the production data to testers.

for this iam generating random number as below and passing to translate function to mask. But it is generating random number contains duplicate digits.
i want to generate random number with each digit is distinct. Any special function for this purpose ?

SQL> select ABS(dbms_random.value(100000000,999999999)) into rndm_num from dual;

ABS(DBMS_RANDOM.VALUE(100000000,999999999))
-------------------------------------------------------------------------
729131083

select translate(Incol,'0123456789',rndm_num ) INTO mask_col FROM DUAL;

return mask_col;

Thanks,
Venkat Vadlamudi