I have a table that looks like this:
DeliveryID LastUpdatedTime 1 5:25AM 1 5:30AM 2 5:35AM 2 5:40AM
For each deliveryID, the update time varies.
I want a query that will give me the maximum time for each deliveryID (for DeliveryID 1 it is 5:30AM), and it should also take into consideration DeliveryIDs that have only one updateTime.
This is pretty straighforward --
select DeliveryID, max(LastUpdatedTime) from yourTable group by DeliveryID
This works whether there's one row per DeliverID group or several.
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This was first published in January 2002