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Editorial Team
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Asked: 2026-06-12T19:32:18+00:00

I have a MYSQL table like this example: [ID]–[Date]–[UserID]–[Username]–[String] 1 12-10-06 02:35:01 25 Jack

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I have a MYSQL table like this example:

[ID]--[Date]--[UserID]--[Username]--[String]

1  12-10-06 02:35:01  25  Jack  string1
2  12-10-06 02:38:01  25  Jack  string2
3  12-10-06 02:40:01  25  Jack  END
4  12-10-06 02:42:01  36  Jill  string1
5  12-10-06 02:45:01  36  Jill  string2
6  12-10-06 02:48:01  36  Jill  END
7  12-10-06 02:50:01  25  Jack  string1
8  12-10-06 02:52:01  25  Jack  string2
9  12-10-06 02:55:01  25  Jack  END

I’m using this MYSQL query to group them:

SELECT m1.Date, m1.Username, m1.UserID
FROM Username m1 LEFT JOIN Username m2
 ON (m1.UserID = m2.UserID AND m1.ID < m2.ID)
WHERE m2.ID IS NULL
ORDER BY Date DESC

It works but the problem with this query is that it only gives the last entry of each user as the output:

6  12-10-06 02:48:01  36  Jill
9  12-10-06 02:55:01  25  Jack

I want to get all sessions as the output, like:

12-10-06 02:35:01 - 12-10-06 02:40:01 25 Jack
12-10-06 02:42:01 - 12-10-06 02:48:01 25 Jill
12-10-06 02:50:01 - 12-10-06 02:55:01 25 Jack

How can I accomplish this with PHP and MYSQL?

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1 Answer

  1. Editorial Team

    Well, I doubt you ever want to query the entire database for sessions, so for the chunk you want, I think I would just fetch the end, and then for each one of them request a different.

    Do something like this

    select UserID, Date, Username from Username order by Date desc limit 10

    And then for each one of those entries you can do

    Get when the last session from the user ended:

    select max(Date) from Username where UserID = $userId and Date < '$date' and String = 'cikis'

    Get the min date between those 2 dates:

    select min(Date) from Username where Date > '$lastSessionEndDate' and Date < '$date'

    It shouldn’t hammer the database too much, just build appropriate indexes and limit your queries to what it’s really useful rather than just presenting a full report on all sessions for no reason.

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