the way you did it is grouping by minute ( not taking year/month/day/hour into account )
This is how I would do it.
SELECT
datepart(mi,[startDate]) as MI,
min(startDate) as startDate,
avg(duration) Duration
FROM Logs with (nolock)
WHERE Id IN ( 'HI' )
/* avoid using BETWEEN with datetime datatype */
AND startdate >='2013-06-17 08:30:00.000' AND startdate < '2013-06-17 10:00:00.000'
AND sourcemodule = 'panel'
group by datepart(mi,[startDate])
order by startdate
it depends on the simantics of what you need.
SELECT
dateadd(mi, datediff(mi,[startDate], 0),0) as MI,
min(startDate) as startDate,
avg(duration) Duration
FROM Logs with (nolock)
WHERE Id IN ( 'HI' )
/* avoid using BETWEEN with datetime datatype */
AND startdate >='2013-06-17 08:30:00.000' AND startdate < '2013-06-17 10:00:00.000'
AND sourcemodule = 'panel'
group by dateadd(mi, datediff(mi,[startDate], 0),0) --convert to datetime minute level
order by startdate
Johan
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