Average hourly rowcounts

Question

Average hourly rowcounts

a2zwd

SSCrazy

Points: 2353
More actions
March 21, 2013 at 4:16 am

#394440

Hi
I have a table with RunId, RunDateTime, RowCount
RunDateTime will be every 15 minutes.
1 2013-03-21 10:00:00 20
2 2013-03-21 10:15:00 30
3 2013-03-21 10:30:00 20
4 2013-03-21 10:45:00 25
5 2013-03-21 11:00:00 15
I want to retrieve hourly average rowcounts
Like
AvgHourlyDateTime AbgRowCount
-----------------------------------------------------------------
2013-03-21 10:00:00To2013-03-21 11:00 (20+30+20+25+15)/5
How can I do this

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Eugene Elutin SSC Guru Points: 59322 More actions · Answer 1

You should start to help our helpers (link at the bottom of my signature), by supplying DDL and sample data insert scripts instead of "I have table like that..." thing.

But anyway:

declare @ihaveatablelikethat table (RunId int, RunDateTime datetime, [RowCount] int)

insert @ihaveatablelikethat

select 1, '2013-03-21 10:00:00', 20

union select 2, '2013-03-21 10:15:00', 30

union select 3, '2013-03-21 10:30:00', 20

union select 4, '2013-03-21 10:45:00', 25

union select 5, '2013-03-21 11:00:00', 15

union select 6, '2013-03-21 11:30:00', 20

union select 7, '2013-03-21 11:45:00', 25

union select 8, '2013-03-21 12:00:00', 15

select DATEADD(HOUR,DATEPART(HOUR,RunDateTime),CAST(CAST(RunDateTime AS DATE) AS DATETIME)) DHFrom

,DATEADD(HOUR,DATEPART(HOUR,RunDateTime)+1,CAST(CAST(RunDateTime AS DATE) AS DATETIME)) DHTo

,AVG([RowCount])

from @ihaveatablelikethat

group by CAST(RunDateTime AS DATE), DATEPART(HOUR,RunDateTime)

Please note: You cannot logically include record for 10:00:00 and 11:00:00 in to the same group (for "Hour 10 to 11"), otherwise, these records will be double counted in bordering groups Hour 9 to 10 and Hour 11 to 12.

I made grouping based on "included" from hour to "excluded" to hour.

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ScottPletcher SSC Guru Points: 100942 More actions · Answer 2

SELECT

DATEADD(HOUR, DATEDIFF(HOUR, 0, RunDateTime), 0) AS AvgHourlyDateTime,

--DATEADD(MILLISECOND, -3, DATEADD(HOUR, DATEDIFF(HOUR, 0, RunDateTime) + 1, 0)) AS AvgHourlyEndDateTime,

AVG([RowCount]) AS AbgRowCount

FROM @ihaveatablelikethat

GROUP BY

DATEADD(HOUR, DATEDIFF(HOUR, 0, RunDateTime), 0)

--,DATEADD(MILLISECOND, -3, DATEADD(HOUR, DATEDIFF(HOUR, 0, RunDateTime) + 1, 0))

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