position change of employee in 2009

I have these data in the table after a few joints

Emp_name Person_id Position effective_start_date effective_end_date

John 1 Developer Junior 23/01/2007-26/12/2008
1 lead developer John 28/01/2009 Null
Null of Peter 2 analyst 16/08/2005
Null of James 3 Analyst Senior 07/05/2009

I need employees whose title has changed in 2009, for example John was developer Junior until the end of 2008, but its title changed to Senior Developer in 2009, so I need a name of resulting query emp, position, new position effective_start_date_new_position in SQL for those has changed in 2009 only!, I did it in pl/sql I just want to know if I can do it in SQL?

In addition,
If you want to watch a specific year, use the function count() &

with t as (
select 'John' Emp_Name, 1 Person_ID, 'Junior Developer' Position, to_date('01-23-2007', 'mm-dd-yyyy') effective_startdate, to_date('12-26-2008','mm-dd-yyyy') effective_enddate from dual union all
select 'John', 1,  'Senior Developer', to_date('01-28-2009', 'mm-dd-yyyy'), Null from dual union all
select 'Peter', 2, 'Analyst', to_date('08-16-2005','mm-dd-yyyy'), Null from dual union all
select 'James', 3, 'Senior Analyst', to_date('05-07-2009','mm-dd-yyyy'), Null from dual
)
, tt as (
 select t.*
       ,sum(decode(to_char(t.Effective_Startdate, 'YY'), '09', 1, 0)) over (partition by t.Person_ID) sn
       ,count(1) over (partition by t.Person_ID) cn
 from t
)
select ttt.* from
(
  select tt.*
        ,lag(tt.Position) over (partition by tt.Person_ID order by tt.effective_startdate) Prev_Pos
  from tt
  where sn > 0
  and   cn > 1
) ttt
where ttt.Prev_Pos != ttt.Position

Published by: bluefrog on April 9, 2010 16:45

Tags: Database

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