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Timestamp calculations between rows

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    Timestamp calculations between rows

    I continue to struggle with what I believe to be basic SQL and dealing with differences between timestamps.

    I have a table as follows:
    Employee#, Job#, Dept#, Category#, Timestamp
    3,C92123,10,115,2013-01-06 15:09:40.25
    3,C92123,10,120,2013-01-06 15:29:40.25
    5,C92123,10,115,2013-01-06 15:09:40.25
    5,C92123.10,120,2013-01-06 15:29:40.25
    3,S00001,99,50,2013-01-06 18:09:40.25
    3,S00001,99,999,2013-01-06 19:19:40.25
    .......

    What I would like to do is to group the data as follows by combining the columns so the basic difference between can calculated. But, maybe they don't even need combined, but instead just give the difference. e.g.

    3,C92123,10,115,2013-01-06 15:09:40.25,2013-01-06 15:29:40.25
    5,C92123,10,115,2013-01-06 15:09:40.25,2013-01-06 15:29:40.25

    I researched on the web and found everything from basic select statements to statements with fancy functions and left outer joins that I didn't couldn't make work.

    I will need to group this in several different ways for employee id#, job#, dept#, and category# depending on the type of report needed. For instance total time on a job, total time on a job by employee, time for an employee for a year by category, etc. i.e. the table massaged about every different way. In my old Access tables, I didn't have timestamps, but instead had already calculated the difference and entered that directly.

    I am sure I am once again over thinking this and is something fairly simple. Maybe I need a "scrartch" table that temporarily holds the info with timestamps and then maybe does the calculation via a trigger and save it in another table like I had with Access?

    Thanks for your thoughts.

    #2
    Re: Timestamp calculations between rows

    Not sure what you are trying to accomplish exactly - sounds like 2 things - grouping and subtraction?

    If you subtract two time values in Alpha you get seconds. So (T2-T1)/3600 = hours.
    Peter
    AlphaBase Solutions, LLC

    [email protected]
    https://www.alphabasesolutions.com


    Comment


      #3
      Re: Timestamp calculations between rows

      Hello Peter,

      Yes I am trying to group and subtract which I know how to do. The part I can't wrap my ahead around is moving the 2nd timestamp row into the equivalent additional column as shown above. This is necessary to export to Excel for other applications and analysis. Probably not verbalizing it very well.

      Taking another step backwards, I am struggling with the proper basic storage concept for these times. In my old Access database, there were no timestamps stored. The actual calculations had already been done and stored as minutes. This worked well until barcode readers were starting to be used. Now it seems that the correct way to store is as above with timestamps, rather than the post-calculated minutes. Not sure down the road how I will create the myriad of reports that give total time on jobs by employees, by department, by category, etc. Very easily done from tables with stored minutes, not so sure with tables with stored timestamps.

      Your thoughts are appreciated.

      Comment


        #4
        Re: Timestamp calculations between rows

        I see. If you want to combine rows in order to export to Excel, I would export to a dummy table where the dummy table has the combined rows. Then your Excel export is simple. You will have to code the first part however.
        Peter
        AlphaBase Solutions, LLC

        [email protected]
        https://www.alphabasesolutions.com


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