Getting clusters of rows close together in time

Posted by Mike on Stack Overflow See other posts from Stack Overflow or by Mike
Published on 2010-04-21T01:07:04Z Indexed on 2010/04/21 1:13 UTC
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Filed under:

sql

|

sql-server

|

sql-server-2008

I have a table basically like so

   ID   |  ItemID  |       Start        |         End        |
---------------------------------------------------------------
    1       234      10/20/09 8:34:22      10/20/09 8:35:10
    2       274      10/20/09 8:35:30      10/20/09 8:36:27
    3       272      10/21/09 12:15:00     10/21/09 12:17:00
    4       112      10/21/09 12:20:14     10/21/09 12:21:21
    5       15       10/21/09 12:22:39     10/21/09 12:24:15

There are two "clusters" of entries here, 1-2 and 3-5 separated by a gap in time, specifically > 30 minutes is what I'm interested in.

What I would like is the first and last rows of the cluster of entries. This is fairly easy to achieve by retrieving all the rows and looping through them in order of start time, but I'd like to have it in SQL if possible.

I'm using SQL Server 2008, thanks.

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