how to select only row with max sequence without using a subquery?

Question

I\'m trying to select only the row with the highest seq for each ID

ID  |  Seq   |  Age
-------------------
 A      1       20   
 A      2       30
 B               


        

Answer 1

In general, you neeed to use windowing or ranking functions - Rank(), Row_number(), etc.

select *
from
(
    select *, row_number() over (partition by id order by age desc) rn
    from yourtable
) v
where rn = 1

This will work in SQL Server 2005+ - in oracle you may need to specify the field names explicitly, instead of the *