Question

I have a table, contains a list of tasks:

ID      TaskName       Date
----------------------------------
1       Task1          2010-11-23
2       Task2          2011-12-01
3       Task1          2012-02-01
4       Task3          2008-01-09
5       Task2          2007-03-09
6       Task3          2000-01-01

how to create a view contain task with its lastest perform date?

e.g result from the above table should be:

id  taskname  date
------------------------
3   Task1     2012-02-01
2   Task2     2011-12-01
4   Task3     2008-01-09

Answer 1

SELECT
  ID,
  TaskName,
  Date
FROM
(
  select 
    ID,
    ROW_NUMBER() OVER (PARTITION BY TaskName ORDER BY Date DESC) Ordinal,
    TaskName,
    Date
  FROM YourTable
) t
WHERE Ordinal = 1