Q

Latest updated time value per group of rows

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

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