Comparing column values within same row

Question

Script
<code>
create table testp
( name varchar2(20),
yr1 number,
yr2 number,
yr3 number,
yr4 number);
insert into testp values ('Jana',500,400,300,900);
insert into testp values ('sarat',200,300,800,100);
commit;
<code>
I need the result like this
<code>
NAME    First_greatest    Second_greatest
Jana       900                   500
sarat       800                   300
<code>
I've used greatest function to get the First_greatest result, but not getting the second_greatest, can you help?
Thanks

Answer 1

Hi,
Here's one way to do that:
WITH got_r_num AS
    SELECT   name
    ,        n
    ,        ROW_NUMBER () OVER ( PARTITION BY  name
                                  ORDER BY      n DESC
                                )   AS r_num
    FROM     testp
    UNPIVOT   (    n
              FOR  yr  IN ( yr1
                          , yr2
                          , yr3
                          , yr4
SELECT    *
FROM      got_r_num
PIVOT     (    MAX (n)
          FOR  r_num  IN ( 1 AS first_greatest
                         , 2 AS second_greatest
Output:
NAME                 FIRST_GREATEST SECOND_GREATEST
Jana                            900             500
sarat                           800             300
Perhaps your data should be stored in an upivoted form in the first place, with each yr on a separate row.