Question

I have 5 rows of data coming into my database every 2 hours from a GSM modem and I require only the last (latest) row of data as thats the only relevant one but need all of the data for a chart…

Is there a way of using something to only recall one row after every fourth.

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Example.

1pm
23, 25, 20,99,21

3pm
34, 56, 55, 65, 30

only showing 21 and 30 in data.

Answer 1

With CTE:

WITH NumberedRows AS
(
    SELECT Serial, DeviceLevel, ROW_NUMBER() OVER (ORDER BY DateReceived DESC) AS RowNumber
    FROM TBLReadings 
) 
SELECT *
FROM NumberedRows
WHERE RowNumber % 5 = 0