how to generate hash code, that contains not only numbers or letters
I managed to generate hash code as number-codes (5515820 and 55):
SELECT dbms_utility.get_hash_value('A'||TO_CHAR(SYSDATE, 'HH:MI:SS'), 8, 10000000),
ORA_HASH('A'||TO_CHAR(SYSDATE, 'HH:MI:SS'), 99, 100)
FROM dual;--5515820 , 55
But i want to generate hash, that contains only letters or only numbers, and i determine the length of the hash.
How to do?