Qry for :::amount of max (eff_Date) for a particular clm ,covg_id ??

Question

existed
clm_nbr covg_id amt eff_date
1 256 0 1/1/2011
1 256 890 1/18/2011
2 258 10 12/5/2011
2 258 77 12/25/2011
required:
clm_nbr covg_id amt eff_date
1 256 890 1/18/2011
2 258 77 12/25/2011
:::amount of max (eff_Date) for a particular clm ,covg_id

Answer 1

First of all thanks user2361373 for posting the query.
Query will work with out any problem.
Please explian how you are saying that it wont work..?
Just add number as per your requirement.
with t as
select 1 clm_nbr, 256 covg_id, 0  amt, date'2011-01-01' eff_date from dual union all
select 1 ,256 ,890, date'2011-01-18'  from dual union all
select 2 ,258 ,10 , date'2011-05-12' from dual union all
select  2 ,258, 77, date'2011-12-25'  from dual
select *from
select clm_nbr, covg_id,  amt,eff_date,row_number() over(partition by clm_nbr order by eff_date desc) rn  from t
) where rn <=2 -- You can add number based on your requirementEdited by: Suri on Nov 10, 2011 2:40 PM
Edited by: Suri on Nov 10, 2011 2:41 PM