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Question

I have an \"Observation\" table in SQL Server 2008. This table has a locationId column for a bunch of geographic locations, a few columns for observation details and a colum

Answer 1

select a.* from observations a inner join 
(select locationid ,max(updateddate) dates  from observations
group by locationid) b
on a.locationid=b.locationid
and a.updateddate=b.dates