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Editorial Team
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Asked: 2026-06-13T07:54:55+00:00

I logging my temperature every 1-3 seconds with unix timestamp, I wish like get

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I logging my temperature every 1-3 seconds with unix timestamp, I wish like get row of data return by average every 1 minute period and last for 24 hour.

my logger table look like this:

unixtime    temp
1350899052  25.37
1350899054  25.44
1350899057  25.44
1350899059  25.44
1350899062  25.44
1350899064  25.44
1350899069  25.44
1350899071  25.44

and i wish like it return as

unixtime    temp
1350899052  25.37 -- average value of 1 minute range both unixtime and temp 
1350899054  25.44
1350899057  25.44

please advise how is mySQL command should i do ? thank.

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1 Answer

  1. Editorial Team

    The following should work:

    SELECT ROUND(unixtime/(60)) AS minute, avg(temp)
    FROM table where unixtime >= UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 1 DAY)) GROUP BY ROUND(unixtime/(60));

    Show date in normal format:

    SELECT from_unixtime(floor(unixtime/(60))*60) AS minute, avg(temp) FROM test where unixtime >= UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 1 DAY)) GROUP BY floor(unixtime/(60))

    outputs:

    minute  avg(temp)
2012-10-24 08:02:00 37.5
2012-10-24 08:03:00 45
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