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How can I select the most recent date entry?

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Last Modified: 2012-05-11
Hi, I'm using sql 2005 express
I would like to select one entry from dbo.DailyStepsGoals based on the studyid  and ds.DateGoalIsSet (DateTime) is the most recent.  How can I put that in Tsql?  Thank you.
select p.StudyId, d.LastName, p.DateOfFirstVisit, ds.TargetNumber as StepTargetNumber, 
from dbo.Patients p inner join dbo.Doctors d on p.DoctorId = d.DoctorId
left join dbo.DailyStepsGoals ds on p.StudyId = ds.StudyId and ds.DateGoalIsSet

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