Calculate the sum of duration ignoring overlapps

• naren.gopalkrishna

  Grasshopper

  Points: 18

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  April 18, 2008 at 12:39 pm

  #206053

  I have used the below query to calculate the sum of duration ignoring overlapps, However this does not take in to account the time in date-time format ie.. For calculations between 23:59 and 00:01 hours, Any suggestion on how this can be extended to be bug free in case of date change overs ?

  DECLARE @Sample TABLE (StartTime DATETIME, EndTime DATETIME)

  INSERT@Sample

  SELECT'07:12', '07:17' UNION ALL--00:05

  SELECT'07:18', '07:24' UNION ALL--00:06

  SELECT'07:33', '07:34' UNION ALL--00:01

  SELECT'07:34', '08:02' UNION ALL--00:28

  SELECT'07:34', '07:43' UNION ALL--00:00

  SELECT'07:43', '07:49' UNION ALL--00:00

  SELECT'07:53', '08:01' UNION ALL--00:00

  SELECT'07:57', '08:10'--00:06

  SELECTCOUNT(DISTINCT v.Number) AS Minutes

  FROMmaster..spt_values AS v

  INNER JOIN(

  SELECTDATEDIFF(MINUTE, '00:00:00', StartTime) AS StartMinute,

  DATEDIFF(MINUTE, '00:00:00', EndTime) AS EndMinute

  FROM@Sample

  ) AS x ON x.StartMinute <= v.Number

  AND x.EndMinute > v.Number

  WHEREv.Type = 'p'

  AND Number < 1440

  The result is 48 minutes.

• Johan Bijnens

  SSC Guru

  Points: 135556

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  April 18, 2008 at 12:55 pm

  #804555

  - did you try just adding the correct date to both columns ?

  - and then just query

  datediff(MINUTE , startdate, enddate) as elapsttime_Minutes

  Johan
  
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• SwePeso

  SSC-Dedicated

  Points: 39758

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  April 18, 2008 at 4:13 pm

  #804618

  Great.

  You start the topic over here

  http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=101129&SearchTerms=DISTINCT,vNumber

  and then you continue here at SQLServerCentral?

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• naren.gopalkrishna

  Grasshopper

  Points: 18

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  April 18, 2008 at 11:13 pm

  #804644

  Hi peter ,

  Sorry I did not receive a reply back from you.

  am in desperate need to get back home finishing my work hence this try....