Oracle 18c

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CREATE TABLE employes (employes_id) AS
SELECT LEVEL FROM DUAL CONNECT BY LEVEL <= 10;
10 rows affected

DECLARE
  TYPE r_emp_id IS TABLE OF NUMBER;
  emps r_emp_id;
  i    PLS_INTEGER;
BEGIN
  SELECT employes_id
  BULK COLLECT INTO emps
  FROM   employes
  ORDER BY employes_id;

  i := FLOOR(DBMS_RANDOM.VALUE(1, emps.COUNT + 1));

  DBMS_OUTPUT.put_line(emps(i)); 
END;
/
1 rows affected

dbms_output:
1

DECLARE
  TYPE r_emp_id IS TABLE OF NUMBER;
  emps r_emp_id;
BEGIN
  SELECT employes_id
  BULK COLLECT INTO emps
  FROM   employes
  ORDER BY DBMS_RANDOM.VALUE;

  FOR i IN 1 .. emps.COUNT LOOP
    DBMS_OUTPUT.put_line(emps(i)); 
  END LOOP;
END;
/
1 rows affected

dbms_output:
4
1
5
9
2
6
10
3
8
7

DECLARE
  emp_id EMPLOYES.EMPLOYES_ID%TYPE;
BEGIN
  SELECT employes_id
  INTO   emp_id
  FROM   employes
  ORDER BY DBMS_RANDOM.VALUE
  FETCH FIRST ROW ONLY;

  DBMS_OUTPUT.put_line(emp_id); 
END;
/
1 rows affected

dbms_output:
6

SELECT employes_id
FROM   employes
ORDER BY DBMS_RANDOM.VALUE
FETCH FIRST ROW ONLY;


EMPLOYES_ID


6