Get only latest row, grouped by a column

Question

I have a large data-set of emails sent and status-codes.

ID Recipient           Date       Status
 1 someone@example.com 01/01/2010      1
 2 someone@example.com         


        

Answer 1

It's not very pretty, but I'd probably just use a couple of subselects:

SELECT Recipient,
    COUNT(*) EmailCount,
    (SELECT Status
     FROM Messages M2
     WHERE Recipient = M.Recipient
         AND Date = (SELECT MAX(Date)
                     FROM Messages
                     WHERE Recipient = M2.Recipient))
FROM Messages M
GROUP BY Recipient
ORDER BY Recipient