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06.28.2008 at 11:24PM PDT, ID: 23524664
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9.9

Determine Time Ranges

Asked by pdarata in SQL Query Syntax, MS SQL Server, SQL Server 2005

Tags:

I have a table with a timestamp on each row,  I am trying to summarize the results to show the time ranges of the stored data.  For example the following table data:

Timestamp
6/21/2008 10:45:53
6/21/2008 10:45:54
6/21/2008 10:45:55
6/21/2008 10:45:56
6/21/2008 10:45:59
6/21/2008 10:46:00
6/21/2008 10:46:02
6/21/2008 10:46:03
6/21/2008 10:46:04
6/21/2008 10:46:05

Should produce results showing the beginning and ending times of the sequences:
Begin                                  End
6/21/2008 10:45:53            6/21/2008 10:45:56
6/21/2008 10:45:59            6/21/2008 10:46:00
6/21/2008 10:46:02            6/21/2008 10:46:05


I have a routine from a cookbook that I tried to adapt but it still produces too many ranges.

SELECT     p1.Timestamp AS dtBegin, p2.Timestamp AS dtEnd
FROM         myTable AS p1 INNER JOIN
                      myTable AS p2 ON p1.Timestamp < p2.Timestamp
WHERE     (NOT EXISTS
                          (SELECT     Timestamp
                            FROM          myTable AS p3
                            WHERE      (Timestamp = DATEADD(ss, - 1, p1.Timestamp)) OR
                                                   (Timestamp = DATEADD(ss, 1, p2.Timestamp))))

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[+][-]06.29.2008 at 12:07AM PDT, ID: 21893212

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[+][-]06.29.2008 at 11:11AM PDT, ID: 21894941

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About this solution

Zones: SQL Query Syntax, MS SQL Server, SQL Server 2005
Tags: SQL
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Solution Provided By: angelIII
Participating Experts: 2
Solution Grade: A
 
 
[+][-]06.30.2008 at 09:15PM PDT, ID: 21904953

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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