Select one row per index value with max column value

Question

With a table setup with the following fields:

SKU, EVENTSTARTDATE, EVENTENDDATE, PRICE, (...etc...)

and housing thousands of rows here is e

Answer 1

other solution

 select distinct f3.* 
 from  yourtable f1
 inner join lateral
       (
        select * from yourtable f2
        where f1.SKU=f2.SKU
        order by EVENTSTARTDATE desc, EVENTENDDATE desc
        fetch first rows only
        ) f3 on 1=1

Answer 2

Have a look at GROUP BY and HAVING clauses.

select sku, max(eventstartdate)
FROM TABLE
group by sku
having eventstartdate <= sysdate

Edit: added HAVING statement

Answer 3

From recent versions of DB2, you can use the analytical function ROW_NUMBER()

SELECT * 
FROM (
    SELECT 
        tablename.*, 
        ROW_NUMBER() OVER (PARTITION BY sku 
                           ORDER BY eventstartdate DESC) As RowNum
        FROM tablename) X 
WHERE X.RowNum=1

For each Partition (group of SKU), the data is row numbered following the order by eventstartdate desc, so 1,2,3,...starting from 1 for the latest EventStartDate. The WHERE clause then picks up only the latest per SKU.