mysql - MySQL grouping results by time periods

Question

I have a table that contains timestamps of session events. I want to query how many sessions I have according to the timestamps when 2 sessions are separated by at least 10 minutes difference of events. Can I count the sessions with an MySql query ?

Thanks

Answer 1

在你的桌子上几乎没有信息，这对你来说只是一个基本的想法，但你可以做这样的事情：-

SELECT COUNT(*)
FROM
(
    SELECT a.TimeStamp AS ThisTimeStamp, MIN(b.TimeStamp) AS NextTimeStamp
    FROM SomeTable a
    INNER JOIN SomeTable b
    ON a.TimeStamp < b.TimeStamp
    GROUP BY a.TimeStamp
) Sub1
WHERE Sub1.ThisTimeStamp < (Sub1.NextTimeStamp - 600)

获取所有时间戳并将它们与所有其他更大的时间戳结合起来，并使用 MIN 将其缩小到下一个最大的时间戳。然后从中选择差异小于 600 秒的计数（假设 unix 时间戳）。

编辑 - 如果你想为用户限制 10 分钟以上的事件间隔，那么： -

SELECT COUNT(*)
FROM
(
    SELECT a.user_id, a.TimeStamp AS ThisTimeStamp, MIN(b.TimeStamp) AS NextTimeStamp
    FROM SomeTable a
    INNER JOIN SomeTable b
    ON a.TimeStamp < b.TimeStamp
    AND a.user_id = b.user_id
    GROUP BY a.user_id, a.TimeStamp
) Sub1
WHERE Sub1.ThisTimeStamp < (Sub1.NextTimeStamp - 600)