Over partition: how to use to return the max of two columns

Question

For each unique id, I want to select the value of col2 in the record with the most recent date.
When the rows with the same IDs have the same dates, I want the max value from col2.
I want one row for each ID, but I'm getting two rows for ID 3333333.
with data as
select 1111111 as id, 'a' as col2, to_date('01-JAN-09','dd-mon-yyyy') as the_date from dual union all
select 2222222 as id, 'b' as col2, to_date('02-JAN-09','dd-mon-yyyy') as the_date from dual union all
select 2222222 as id, 'c' as col2, to_date('03-JAN-09','dd-mon-yyyy') as the_date from dual union all
select 2222222 as id, 'd' as col2, to_date('04-JAN-09','dd-mon-yyyy') as the_date from dual union all
select 3333333 as id, 'e' as col2, to_date('05-JAN-09','dd-mon-yyyy') as the_date from dual union all
select 3333333 as id, 'f' as col2, to_date('05-JAN-09','dd-mon-yyyy') as the_date from dual
select id, col2, the_date
from
select id, the_date, col2, max(the_date) over (partition by id) as max_the_date, max(col2) over (partition by col2) as max_col2
from data
where the_date = max_the_date and col2 = max_col2 order by id
Expecting this:
ID     COL2     THE_DATE
1111111     a     1/1/0009
2222222     d     1/4/0009
3333333     f     1/5/0009
but I'm getting 2 rows for ID 3333333
Any suggestions?

Answer 1

TRy this code without subquery
SELECT   ID, MAX (the_date)KEEP (DENSE_RANK LAST ORDER BY the_date),
         MAX (col2)KEEP (DENSE_RANK LAST ORDER BY the_date)
    FROM DATA
GROUP BY ID
ORDER BY ID
SQL> WITH DATA AS
  2       (SELECT 1111111 AS ID, 'a' AS col2,
  3               TO_DATE ('01-01-2009', 'dd-mm-yyyy') AS the_date
  4          FROM DUAL
  5        UNION ALL
  6        SELECT 2222222 AS ID, 'b' AS col2,
  7               TO_DATE ('02-01-2009', 'dd-mm-yyyy') AS the_date
  8          FROM DUAL
  9        UNION ALL
10        SELECT 2222222 AS ID, 'c' AS col2,
11               TO_DATE ('03-01-2009', 'dd-mm-yyyy') AS the_date
12          FROM DUAL
13        UNION ALL
14        SELECT 2222222 AS ID, 'd' AS col2,
15               TO_DATE ('04-01-2009', 'dd-mm-yyyy') AS the_date
16          FROM DUAL
17        UNION ALL
18        SELECT 3333333 AS ID, 'e' AS col2,
19               TO_DATE ('05-01-2009', 'dd-mm-yyyy') AS the_date
20          FROM DUAL
21        UNION ALL
22        SELECT 3333333 AS ID, 'f' AS col2,
23               TO_DATE ('05-01-2009', 'dd-mm-yyyy') AS the_date
24          FROM DUAL)
25  SELECT   ID, MAX (the_date)KEEP (DENSE_RANK LAST ORDER BY the_date ),
26           MAX (col2)KEEP (DENSE_RANK LAST ORDER BY the_date )
27      FROM DATA
28      group by id
29  ORDER BY ID;
        ID MAX(THE_DA M
   1111111 2009-01-01 a
   2222222 2009-01-04 d
   3333333 2009-01-05 f
SQL> Edited by: Salim Chelabi on 2009-03-05 11:49
Edited by: Salim Chelabi on 2009-03-05 11:50