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Calculating time differences based on a group


I have a table with about 60000 records which look something like this:




    Group, Start_datetime, Stop_datetime

    "A", "2012-05-01 12:00:01", "2012-05-01 12:15:11",

    "B", "2012-05-01 13:00:01", "2012-05-01 13:15:11",

    "A", "2012-05-01 16:00:01", "2012-05-01 17:13:54",

    "A", "2012-05-02 05:00:01", "2012-05-02 12:15:11",

    "B", "2012-05-02 12:00:01", "2012-05-02 13:15:11",

    "C", "2012-05-02 13:00:01", "2012-05-02 14:15:11"


Now I would like to calculate the difference in time between Start_datetime and previous Start_datetime, grouped by the column Group. The result would be something like this:

GroupStart_datetimeStop_datetimeTime since last one
A2012-05-01  12:00:012012-05-01  12:15:11n/a
A2012-05-01  16:00:012012-05-01  17:13:5404:00:00
A2012-05-02  05:00:012012-05-02  12:15:1113:00:00
B2012-05-01  13:00:012012-05-01  13:15:11n/a
B2012-05-02  12:00:012012-05-02  13:15:1123:00:00
C2012-05-02  13:00:012012-05-02  14:15:11n/a

The next step would be to calculate the sum of all "time since last one" over a time dimension (year) and group.

The problem is not to calculate the time difference. I found the functions previous() and peak() for addressing the previous line, and interval() and timestamp() to calculate the difference and display it in any format. However - I can not find out a way to group the lines by the column Group and calculate only the matching lines!

If you could present me a solution or a hint thereof, I would be grateful.


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