Get daily data from hourly

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I have query which returns hourly data. But I want to get daily data from this query, so all the hourly data per day would be averaged to daily data.

What I have tried:

declare @Days int

set @Days = -1

select      

dateadd(hour,datepart(hour,Timestamp),cast(CAST((Timestamp) as date) as datetime)) as [Time]  
,[Value]    

from  [Employee]

where dateadd(hour,datepart(hour,Timestamp),cast(CAST((Timestamp) as date) as datetime)) >= CONVERT(date, DATEADD(DAY, @Days, GETDATE()))

Posted 25-Jul-18 12:41pm

Member 13863605

Updated 26-Jul-18 9:22am

v3

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[no name] 26-Jul-18 4:51am

And, so? It "looks" like it might work.

Member 13863605 26-Jul-18 14:38pm

no this gives me hourly data not daily

Tomas Takac 26-Jul-18 6:05am

I believe you are looking for GROUP BY[^].

Member 13863605 26-Jul-18 15:23pm

yes. I have provided my answer below

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Member 13863605 · Answer 1 · 2018-07-26T09:23:00

Solution 1

DECLARE @Days int = -1;
SELECT 
      CAST(Timestamp AS date) AS date
    , AVG(Value) AS Value
FROM  [Employee]
WHERE Timestamp >= DATEADD(day, @Days, CAST(GETDATE() AS date))
GROUP BY CAST(Timestamp AS date)
ORDER BY date;

Posted 26-Jul-18 9:23am

Member 13863605