Oracle View Sequence Test

CREATE SEQUENCE seq_test 
  MINVALUE 1 START WITH 1 INCREMENT BY 1 CACHE 20
/
CREATE OR REPLACE FUNCTION func_seq_test (p_sequence in VARCHAR2) RETURN NUMBER IS
   l_nextval NUMBER;
BEGIN
   EXECUTE IMMEDIATE 'select ' || p_sequence || '.nextval from dual'
         INTO l_nextval;

   RETURN l_nextval;
END;
/
CREATE OR REPLACE VIEW view_seq_test AS 
SELECT   func_seq_test('seq_test') seq_id
,        dummy
FROM     dual
/
SELECT * FROM view_seq_test
/
DROP SEQUENCE seq_test
/
DROP FUNCTION func_seq_test
/
DROP VIEW view_seq_test
/