Question

I have some records as in the image. I want to write a sql query to fetch the latest unique records so that I only have two records on the basis of UserAlertTicketID and latest Created Date. In this case the output would be like:

“CB23C56F-B067-415E-AD62-59DF4DA4F26D” “2” “2011-03-04 09:49:59.440” “9EDB3DBC-4685-414D-A48B-04CA8285A2D1”

“9FA4D72B-8BB3-4CE9-BCA2-C334AF47EB30” “3” “2011-03-04 09:05:46.817” “94C67A9C-3818-4AB5-A6F6-CD7BD69FAEC7”

Kindly Help!!!

Thanks

Answer 1

SELECT TOP 2 * FROM table GROUP BY UserAlertTicketID ORDER BY CreatedDate DESC

EDIT: this may not do what you want, however try this:

SELECT TOP 2 T1.* FROM Table T1 LEFT JOIN Table T2 
ON (T1.AlertTicketEventID = T2.AlertTicketEventID AND T1.CreatedDate < T2.CreatedDate) 
WHERE T2.AlertTicketEventID IS NULL ORDER BY T1.CreatedDate DESC

This method will avoid using aggregates and should be much faster.