dbms_random string with restrictions

Hello. I want to generate a random string with certain restrictions. I need return numbers between 0-9 and letters from A - F. For those of you asking why the specific request, I need to create a string that is compatible with the unique identifier of the SQL SERVER. Jacky ideas how to add restrictions in the following lines.
SELECT dbms_random.string('X', 32) AS Random_String
           INTO v_rand_string
           FROM dual;

You have to use DBMS_RANDOM (which will inevitably generate duplicates)? If you try to be compatible with the unique identifier for SQL Server, why not use SYS_GUID, which is

SELECT sys_guid()
  FROM dual

Justin

Tags: Database

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