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Editorial Team
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Asked: 2026-06-13T01:38:25+00:00

Calculating time frames between status using SQL 2008/2012 I’ve the following table who store

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Calculating time frames between status using SQL 2008/2012

I’ve the following table who store the status of a student

+----+-----------+------------------+---------+---------+
| ID | PERSON_ID |    TIMESTAMP     | IN_HOME | STUDYNG |
+----+-----------+------------------+---------+---------+
|  1 |         1 | 17/10/2012 19:00 |       0 |       0 |
|  2 |         1 | 17/10/2012 19:02 |       1 |       0 |
|  3 |         1 | 17/10/2012 19:03 |       1 |       1 |
|  4 |         1 | 17/10/2012 19:04 |       1 |       1 |
|  5 |         1 | 17/10/2012 19:05 |       1 |       0 |
|  6 |         1 | 17/10/2012 19:10 |       0 |       0 |
|  7 |         1 | 17/10/2012 19:12 |       0 |       0 |
|  8 |         1 | 17/10/2012 19:20 |       1 |       0 |
|  9 |         1 | 17/10/2012 19:25 |       1 |       0 |
| 10 |         1 | 17/10/2012 19:26 |       1 |       1 |
| 11 |         1 | 17/10/2012 19:30 |       1 |       0 |
+----+-----------+------------------+---------+---------+

And i would like to produce results in 2 ways to make some reports:

I:

+-----------+------------------+------------------+---------+---------+
| PERSON_ID |      START       |       END        | IN_HOME | STUDYNG |
+-----------+------------------+------------------+---------+---------+
|         1 | 17/10/2012 19:00 | 17/10/2012 19:02 |       0 |       0 |
|         1 | 17/10/2012 19:02 | 17/10/2012 19:03 |       1 |       0 |
|         1 | 17/10/2012 19:03 | 17/10/2012 19:05 |       1 |       1 |
|         1 | 17/10/2012 19:05 | 17/10/2012 19:10 |       1 |       0 |
|         1 | 17/10/2012 19:10 | 17/10/2012 19:20 |       0 |       0 |
|         1 | 17/10/2012 19:20 | 17/10/2012 19:26 |       1 |       0 |
|         1 | 17/10/2012 19:26 | 17/10/2012 19:30 |       1 |       1 |
+-----------+------------------+------------------+---------+---------+

II:

+-----+------------------+------------------+--------+---------+----------+----------+
| PID |      START       |       END        | InHOME | TotTIME | FreeTIME | StudTIME |
+-----+------------------+------------------+--------+---------+----------+----------+
|   1 | 17/10/2012 19:00 | 17/10/2012 19:02 |      0 | 2min    | 2min     | 0min     |
|   1 | 17/10/2012 19:02 | 17/10/2012 19:10 |      1 | 8min    | 6min     | 2min     |
|   1 | 17/10/2012 19:10 | 17/10/2012 19:20 |      0 | 10min   | 10min    | 0min     |
|   1 | 17/10/2012 19:20 | 17/10/2012 19:26 |      1 | 6min    | 6min     | 0min     |
+-----+------------------+------------------+--------+---------+----------+----------+

What’s the best solution to solve this problems?

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1 Answer

  1. Editorial Team

    First one may look like this. I just don’t understand, why you have STUDYING = 0 in last row of report I (mistake may be?)

    select
    T.PERSON_ID,
    min(T.[TIMESTAMP]) as START,
    CALC.[TIMESTAMP] as [END],
    T.IN_HOME, T.STUDYNG
from @Temp as T
    cross apply
    (
        select top 1 TT.*
        from @Temp as TT
        where 
            TT.PERSON_ID = T.PERSON_ID and TT.[TIMESTAMP] > T.[TIMESTAMP] and
            (TT.IN_HOME <> T.IN_HOME or TT.STUDYNG <> T.STUDYNG)
        order by TT.[TIMESTAMP] asc
    ) as CALC
group by 
    T.PERSON_ID,
    CALC.[TIMESTAMP],
    T.IN_HOME, T.STUDYNG
order by START
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