Question

I have this table structure:

ID BIGINT IDENTITY(1,1)
deviceID BIGINT NOT NULL,
entryTime DATETIME2 NOT NULL,
value FLOAT,
PRIMARY KEY (ID),
UNIQUE KEY (deviceID, entryTime)

I have about 15 million rows in this table and I want to fill another table with aggregated data from this table. I want to group this data by deviceID into “buckets” of size one day and take the min, max, and average of the values for that day. Any idea how I do that?

Answer 1

Something like:

SELECT CONVERT(DATE,entryTime) [Date],
       deviceId,
       MIN(Value) MinValue,
       MAX(Value) MaxValue,
       AVG(Value) AvgValue
FROM YourTable
GROUP BY CONVERT(DATE,entryTime),
         deviceId