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 Transact-SQL (2008)
 Return highest value from each day
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Nice SOP
Starting Member

1 Posts

Posted - 07/09/2013 :  16:29:31  Show Profile  Reply with Quote
I have a database containing server populations at 5 minute intervals(logged as timestamp). I want to return a chart containing only the highest server poulation from each day. How would I code this task?

James K
Flowing Fount of Yak Knowledge

3323 Posts

Posted - 07/09/2013 :  16:34:06  Show Profile  Reply with Quote
quote:
Originally posted by Nice SOP

I have a database containing server populations at 5 minute intervals(logged as timestamp). I want to return a chart containing only the highest server poulation from each day. How would I code this task?

SELECT
	*
FROM
(
	SELECT *,
		ROW_NUMBER() OVER (PARTITION BY Date ORDER BY POPULATION DESC) AS RN
	FROM
		YourServerPopulationTable
) s WHERE RN = 1;
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visakh16
Very Important crosS Applying yaK Herder

India
52249 Posts

Posted - 07/10/2013 :  03:13:44  Show Profile  Reply with Quote

SELECT *
FROM
(
SELECT ROW_NUMBER() OVER (PARTITION BY DATEDIFF(dd,0,[timestamp]) ORDER BY POPULATION DESC) AS Seq,*
FROM Table 
)t
WHERE Seq=1


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SwePeso
Patron Saint of Lost Yaks

Sweden
29910 Posts

Posted - 07/10/2013 :  03:24:18  Show Profile  Visit SwePeso's Homepage  Reply with Quote
A timestamp is NOT a datatype used for temporal data. It is a version mechanism.
Can you please clarify your table structure?



N 56°04'39.26"
E 12°55'05.63"
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