Grouping in t-sql with latest dates
Question
I have a table like this
Event ID | Contract ID | Event date | Amount | ---------------------------------------------- 1 | 1 | 2009-01-01 | 100 | 2 | 1 | 2009-01-02 | 20 | 3 | 1 | 2009-01-03 | 50 | 4 | 2 | 2009-01-01 | 80 | 5 | 2 | 2009-01-04 | 30 |
For each contract I need to fetch the latest event and amount associated with the event and get something like this
Event ID | Contract ID | Event date | Amount | ---------------------------------------------- 3 | 1 | 2009-01-03 | 50 | 5 | 2 | 2009-01-04 | 30 |
I can't figure out how to group the data correctly. Any ideas?
Thanks in advance.
Solution
SQL 2k5/2k8:
with cte_ranked as (
select *
, row_number() over (
partition by ContractId order by EvantDate desc) as [rank]
from [table])
select *
from cte_ranked
where [rank] = 1;
SQL 2k:
select t.*
from table as t
join (
select max(EventDate) as MaxDate
, ContractId
from table
group by ContractId) as mt
on t.ContractId = mt.ContractId
and t.EventDate = mt.MaxDate
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