Create a view

Question

Hi
I want to create a view with the latest start date
Thanks in advance
regards
anna
create table staff
(staff_id number
,person_name varchar2(10)
,dept_id number
,start_date date
insert into staff values (10, 'Alan', 100, '01-Dec-2000');
insert into staff values (10, 'Alan', 200, '10-Jun-2007');
insert into staff values (10, 'Alan', 300, '01-Jul-2010');

Answer 1

Query for view
select * from staff where ROWID
IN
select ROWID FROM
  select ROWID ,row_number()  Over (partition by STAFF_ID,PERSON_NAME order by Start_date desc) r
  from staff
  ) where rn=1
  STAFF_ID PERSON_NAM    DEPT_ID START_DAT
        10 Alan              300 01-JUL-10
        10 Scott             100 01-DEC-10