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    <p>Try this, instead of <code>#tbl</code> put your table name:</p> <pre><code>DROP TABLE #tbl CREATE TABLE #tbl([Date] DATETIME, [Status] INT) INSERT #tbl VALUES ('2012-09-01 00:01:00.000', 2), ('2012-09-01 04:17:00.000', 4), ('2012-09-01 04:34:00.000', 4), ('2012-09-01 04:35:00.000', 4), ('2012-09-01 04:35:48.000', 4), ('2012-09-01 04:35:51.000', 1), ('2012-09-01 17:28:25.000', 2), ('2012-09-01 23:58:00.000', 4), ('2012-09-01 23:59:00.000', 1), -- for 2012-09-05 there are no statuses 1 or 2 --('2012-09-05 00:01:00.000', 2), ('2012-09-05 04:17:00.000', 4), ('2012-09-05 04:34:00.000', 4), ('2012-09-05 04:35:00.000', 4), ('2012-09-05 04:35:48.000', 4), ('2012-09-05 04:35:51.000', 4), ('2012-09-05 17:28:25.000', 4), ('2012-09-05 23:58:00.000', 4) --('2012-09-05 23:59:00.000', 1) ;WITH tbl AS ( SELECT *, ROW_NUMBER() OVER (ORDER BY [Date]) id FROM #tbl ), b AS ( SELECT MIN([Date]) MinDate, MAX([Date]) MaxDate, CAST([Date] AS DATE) dateWithoutTime FROM tbl GROUP BY CAST([Date] AS DATE) ), a AS ( SELECT *, ROW_NUMBER() OVER (ORDER BY [Date]) num FROM tbl LEFT JOIN b ON b.MaxDate = [Date] OR b.MinDate = [Date] WHERE [Status] IN (2, 1) OR [Date] = CASE WHEN NOT EXISTS (SELECT 1 FROM #tbl c WHERE c.Status = 2 AND CAST(c.[Date] AS DATE) = b.dateWithoutTime) THEN b.MinDate END OR [Date] = CASE WHEN NOT EXISTS (SELECT 1 FROM #tbl c WHERE c.Status = 1 AND CAST(c.[Date] AS DATE) = b.dateWithoutTime) THEN b.MaxDate END ) SELECT tbl.Date, tbl.Status, CASE WHEN a2.num % 2 = 0 THEN DATEDIFF(MINUTE, a1.Date, a2.Date) END Diff FROM tbl LEFT JOIN a a2 ON tbl.id = a2.id LEFT JOIN a a1 ON a2.num = a1.num + 1 ORDER BY [Date] </code></pre>
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    1. USIvan G
    1. USIvan G
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    1. COYou're welcome, I hope it will help...
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    2. COThanks Man you are quick.. slightly changed in the data sometimes you will not get the status 2 at it will be ('2012-09-01 00:01:00.000', 4) and end of the day at it will be ('2012-09-01 23:59:00.000', 4) so they start will be the first record and end will be last record and in between you may have 2 and 1 also.. Can you help.. please
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    3. COHi ivan, i have commented on your query can you have a look and any thoughts on this please..
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