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select top row for multiple entry for a date in table

Posted By:      Posted Date: September 21, 2010    Points: 0   Category :Sql Server

My current query is

select  Date= createdon , Total=count(*) from ReportDetail where 
reportid = 9 and (CreatedOn BETWEEN '07/01/2010' AND '09/30/2010') 
group by  createdon
order by createdon desc

return data like

2010-09-21 09:36:46.493    112
2010-09-21 08:33:12.667    114
2010-09-21 07:45:20.830    176
2010-09-21 07:33:34.340    114
2010-09-20 07:27:43.753    125
2010-09-17 10:04:27.120    75
2010-09-16 11:50:05.777    52

What I am looking for

2010-09-21 09:36:46.493    112
2010-09-17 10:04:27.120    75
2010-09-16 11:50:05.777    52

Basically for 9/21, I want to get only one latest row. Please advice.

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