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Asked: 2026-05-10T21:00:38+00:00

SELECT avg(con_hits) as avg_hits FROM content WHERE con_type = 1 AND con_posttime < $twelve_hrs_ago

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SELECT    avg(con_hits) as avg_hits  FROM    content  WHERE    con_type = 1    AND con_posttime < $twelve_hrs_ago    AND con_refresh = 0  ORDER BY    con_posttime DESC  LIMIT 100

I would like it to go to the first record that was posted at least 12 hours ago (denoted by the $twelve_hrs_ago variable which has the suitable timestamp), and take the average of the con_hits column, for the next 100 records. In my example, it disregards the LIMIT, and takes the average of every record in the table.

Is there a way to bypass that?

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1 Answer

  1. LIMIT is applied to the resultset, after AVG is calculated. You can do what you want, with a subselect:

    SELECT avg(con_hits) as avg_hits FROM (   SELECT con_hits   FROM content   WHERE     con_type = 1     AND con_posttime < $twelve_hrs_ago     AND con_refresh = 0   ORDER BY con_posttime DESC   LIMIT 100 ) x;

    You can use the database to calculate the time offset too. Replace $twelve_hrs_ago above with:

    date_add(now(), interval -12 hour)
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