Combine Values by Hour

Question

I am doing something and I believe I am doing it quite wrong. When I plug the data into a light switch app in Visual Studio, I get a JSON error. I am getting my data every 15 minutes. I need to present this data by the hour. Here is my design at the
moment. It works fine until you try to use it in the Light switch app.  I keep thinking there has to be a more efficient way to do this then how I am doing it.
Here, I am taking the data from the export, converting the time, and pulling the Channel data I need, then sum hourly usage.
SELECT TOP (100) PERCENT p_mtrid AS MeterID, p_mtrchn AS Channel, DATEPART(Month, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2)
+ ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)) AS Month, DATEPART(day, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2)
+ ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)) AS Day, DATEPART(year, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2)
+ ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)) AS Year, DATEPART(hour, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2)
+ ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)) AS Hour, CONVERT(decimal(10, 4), SUM(p_usage)) AS HourlyUsage
FROM dbo.utsProfile
GROUP BY p_mtrid, p_mtrchn, DATEPART(Month, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2) + ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)),
DATEPART(day, CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2) + ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)), DATEPART(year,
CAST(SUBSTRING(p_dtm, 1, 8) + ' ' + SUBSTRING(p_dtm, 9, 2) + ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime)), DATEPART(hour, CAST(SUBSTRING(p_dtm, 1, 8)
+ ' ' + SUBSTRING(p_dtm, 9, 2) + ':' + SUBSTRING(p_dtm, 11, 2) AS SmallDateTime))
HAVING (p_mtrchn = 1)
ORDER BY MeterID, Month, Day, Year, Hour
Then I convert it back to SmallDateTime and put all 3 channels together.
SELECT TOP (100) PERCENT dbo.HourlyKWH.MeterID, CONVERT(SmallDateTime, CAST(dbo.HourlyKWH.Month AS VARCHAR(2))
+ '-' + CAST(dbo.HourlyKWH.Day AS VARCHAR(2)) + '-' + CAST(dbo.HourlyKWH.Year AS VARCHAR(4)) + ' ' + CAST(dbo.HourlyKWH.Hour AS VARCHAR(2)) + ':00')
AS DateTime, CONVERT(decimal(10, 4), dbo.HourlyKWH.HourlyUsage) AS KWH, CONVERT(decimal(10, 4), dbo.HourlyKVAH.HourlyUsage) AS KVAH,
CONVERT(decimal(10, 4), dbo.HourlyKVARH.HourlyUsage) AS KVARH
FROM dbo.HourlyKWH INNER JOIN
dbo.HourlyKVAH ON dbo.HourlyKWH.MeterID = dbo.HourlyKVAH.MeterID AND dbo.HourlyKWH.Month = dbo.HourlyKVAH.Month AND
dbo.HourlyKWH.Day = dbo.HourlyKVAH.Day AND dbo.HourlyKWH.Year = dbo.HourlyKVAH.Year AND dbo.HourlyKWH.Hour = dbo.HourlyKVAH.Hour INNER JOIN
dbo.HourlyKVARH ON dbo.HourlyKWH.MeterID = dbo.HourlyKVARH.MeterID AND dbo.HourlyKWH.Month = dbo.HourlyKVARH.Month AND
dbo.HourlyKWH.Day = dbo.HourlyKVARH.Day AND dbo.HourlyKWH.Year = dbo.HourlyKVARH.Year AND dbo.HourlyKWH.Hour = dbo.HourlyKVARH.Hour
ORDER BY dbo.HourlyKWH.MeterID, DateTime
This is presenting the data the way I need it to look but, I cannot use it in lightswith. JSON error. Is there a better way to SUM usage by using DATEPART? 
Thank you very much in advance. I might need to read over this and reword it.

Answer 1

Hi,
There is nice forum on Visual Studio LightSwitch - General Questions :
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=lightswitch
Ahsan Kabir Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread. http://www.aktechforum.blogspot.com/