Average by day SQL

Question

I need to have a table with the average by hour or by day of a table. The problem is the average is made by hour/min/sec

Here's the query:

Answer 1

For SQL you need to CONVERT the date

SELECT CONVERT(VARCHAR(10), DATE_PEREMPTION, 112) AS TIME_PERIOD, AVG(MESURE) AS MESURE
...
GROUP BY TIME_PERIOD
ORDER BY TIME_PERIOD

This might be a useful reference : https://www.sqlservertutorial.net/sql-server-system-functions/convert-datetime-to-string/

Answer 2

I solved using this code.

SELECT cast(DATE_PEREMPTION as date) as DATE_PEREMPTION, ROUND(STDEV(MESURE),3) AS MESURE

FROM [MECMAS].[dbo].[T_Batch] B Join [MECMAS].[DBO].[TR_BATCH_MP] MP ON ([MP].ID_BATCH =B.ID )

Join [mecmas].[dbo].[T_DONNEES] d on (d.ID=MP.ID_DONNEES)

WHERE B.DATE_PEREMPTION >= '2022-01-01 00:00:00.00' AND NAME='AGUA' group by cast(DATE_PEREMPTION as date) ORDER BY DATE_PEREMPTION

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