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 Non Null as an Aggregate
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Yak Posting Veteran

78 Posts

Posted - 02/14/2013 :  06:51:02  Show Profile  Reply with Quote
I need to insert tqo more colums in the below query where instead of Max or Min , I need to get the first non null value. Can any some one help?

t1.ProcessSegmentS95Id as 'Segment',t2.ProcessSegmentS95Id as 'ChildSegment',
MIN(t1.StartTime) as 'SegmentStartTime' , MAX(t1.EndTime)as 'SegmentEndTime',
MIN(t2.StartTime) as 'ChildSegmentStartTime' , MAX(t2.EndTime)as 'ChildSegmentEndTime'

 FROM (SELECT * FROM [SOADB].[dbo].[SegmentResponse] where Depth = 0 ) t1 
  INNER join 
  (SELECT * FROM [SOADB].[dbo].[SegmentResponse] where Depth=1) t2
  on t1.SegmentResponseId = t2.ParentSegmentResponseId
  group by t1.ProcessSegmentS95Id ,t2.ProcessSegmentS95Id
   order by t1.ProcessSegmentS95Id ,t2.ProcessSegmentS95Id

James K
Flowing Fount of Yak Knowledge

3865 Posts

Posted - 02/14/2013 :  08:02:32  Show Profile  Reply with Quote
When you say "first non null value", that implies an ordering scheme for the rows other than StartTime. What is that ordering scheme?
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