MS Access summing on 8-hours

I have a data table with a time stamp (general date format: 1/7/2013 8:49:04 AM) which has a data point for every minute.

I need a sum query to sum on 8-hour periods.
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hgj1357Author Commented:
This is how I sum on a daily resolution:

SELECT Format([Date-Time],"yyyy-mm-dd") AS MyTIme, Sum(T_41s.Flow) AS SumOfFlow
FROM T_41s
GROUP BY Format([Date-Time],"yyyy-mm-dd");
SELECT Format([Date-Time],"yyyy-mm-dd") AS MyTIme,iif(hour([Date-Time])<8, 1,iif(Hour([Date-Time])<16,2,3)) as MyPeriod, Sum(T_41s.Flow) AS SumOfFlow
FROM T_41s
GROUP BY Format([Date-Time],"yyyy-mm-dd"),iif(hour([Date-Time])<8, 1,iif(Hour([Date-Time])<16,2,3))

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Dale FyeCommented:
If you add another table (tbl_Times) to your database, with fields (Title, StartTime, EndTime) and values:

Title      StartTime          EndTime
00-08       #00:00:00#        #08:00:00#
08-16     #08:00:00#        #16:00:00#
16-24   #16:00:00#        #24:00:00#

Then you could do something like:

SELECT Format([Date-Time], "yyyy-mm-dd") & " " & T.Title as Period
             SUM(T_41s.Flow) as SumOfFlow
FROM T_41s
INNER JOIN tbl_Times as T
ON TimeValue(T_41s.[Date-Time]) >= T.StartTime
AND TimeValue(T_41s.[Date-Time]) < T.EndTime
GROUP BY Format([Date-Time], "yyyy-mm-dd") & " " & T.Title
hgj1357Author Commented:
Does the job. Thanks
Dale FyeCommented:
If you want to show all of the time ranges for each date, even if no data exists for that range.  Then you could modify my SQL above Like:

SELECT Format([Date-Time], "yyyy-mm-dd") & " " & T.Title as Period
             SUM(iif(TimeValue([Date-Time]) >= T.StartTime AND
                          TimeValue([Date-Time]) < T.EndTime, T_41s.Flow, 0)) as SumOfFlow
FROM T_41s, tbl_Times as T
GROUP BY Format([Date-Time], "yyyy-mm-dd") & " " & T.Title
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