Generate random number in Oracle

Sometimes you need unique random number. Here is code for PL/SQL

FUNCTION GetRandNumber RETURN Number IS

 l_seed BINARY_INTEGER;
 l_random_num NUMBER(5);
 l_date VARCHAR2(25);
 l_random VARCHAR2(4);

BEGIN
  l_seed := TO_NUMBER(TO_CHAR(SYSTIMESTAMP, 'FF'));
  DBMS_RANDOM.initialize (val => l_seed);
  l_random_num := TRUNC(DBMS_RANDOM.value(low => 1, high => 65535));
  DBMS_RANDOM.terminate;
  return l_random_num;


END GetRandNumber;