Select Most Recent States From History Table

Question

I have inherited a table with a structure something like this:

ID   Name   Timestamp   Data
----------------------------
1    A      40          ...
2    A               


        

Answer 1

SQL Server 2005 (onwards):

WITH MostRecentRows AS
(
    SELECT ID, Name, Data,
    ROW_NUMBER() OVER (PARTITION BY Name ORDER BY TimeStamp DESC) AS 'RowNumber'
    FROM MySchema.MyTable
) 
SELECT * FROM MostRecentRows 
WHERE RowNumber = 1