Selective Aggregation SQL; Not the regular Group by


Selective Aggregation SQL; Not the regular Group by



My Dataset looks like this . Alert levels follow a priority :


C > O > W



The open and closed Dates follow the alert level priorities .
Eg: An Alert level 'W' with an Closed Date greater than a Open Date of an Alert Level 'O' , will take the closed date of the open date of C. (I did this part using CTE) the resultant Data set is as below. Now , the challenge is the eliminate 2 consecutive same alert levels to only one with min of the 2 open dates and max of the 2 closed dates between them ( read first 2 'W')



Dataset :


ID axlenumber alertlevel closeReason OpenDate closeddate
100 1 W HIGHER_LEVEL_ALERT 10/15/2008 0:00 1/27/2009 0:00
100 1 W HIGHER_LEVEL_ALERT 1/22/2009 0:00 1/27/2009 0:00
100 1 O REPAIR 1/27/2009 0:00 3/27/2009 0:00
100 1 C REPAIR 1/27/2009 0:00 3/27/2009 0:00
100 1 W HIGHER_LEVEL_ALERT 5/27/2012 0:00 8/18/2012 0:00
100 1 W REPAIR 5/27/2012 0:00 8/18/2012 0:00
100 1 C REPAIR 5/27/2012 0:00 8/18/2012 0:00
100 1 W HIGHER_LEVEL_ALERT 6/22/2016 0:00 7/21/2017 0:00
100 1 O HIGHER_LEVEL_ALERT 7/2/2017 0:00 11/15/2017 0:00
100 1 C REPAIR 7/21/2017 0:00 11/15/2017 0:00



My desired Dataset should look like:


ID axlenumber alertlevel closeReason OpenDate closeddate
100 1 W HIGHER_LEVEL_ALERT 10/15/2008 0:00 1/27/2009 0:00

100 1 O REPAIR 1/27/2009 0:00 1/27/2009 0:00
100 1 C REPAIR 1/27/2009 0:00 3/27/2009 0:00

100 1 W REPAIR 5/27/2012 0:00 5/27/2012 0:00
100 1 C REPAIR 5/27/2012 0:00 8/18/2012 0:00
100 1 W HIGHER_LEVEL_ALERT 6/22/2016 0:00 7/2/2017 0:00
100 1 O HIGHER_LEVEL_ALERT 7/2/2017 0:00 7/21/2017 0:00
100 1 C REPAIR 7/21/2017 0:00 11/15/2017 0:00



Thanks in Advance Team,
Arvin





Someone please help me with the edit and make it look like a dataset. Am not able to. Thanks and my apologies
– Itachiara
Jun 26 at 15:50





You could make it look like a dataset using create table ..., insert into ... statements. SqLFiddle would help you on that.
– Cetin Basoz
Jun 26 at 15:55






So you're saying that the first two rows of sample data are "consecutive", closing on 1/27/09 and opening on 1/22/09, and should be combined. The desired result row covers 10/15/08 to 1/27/09, not 10/15/08 to 3/27/09 as I would expect if the rows were combined. What am I missing? Please read this for some tips on improving your question.
– HABO
Jun 26 at 17:35






@HABO-- Thats my typo : its 1/27/2009 . My apologies.
– Itachiara
Jun 26 at 18:22





Okay. And "consecutive" means "overlapping in any way"? The fifth and sixth input rows are combined because they are both alertlevel "W" and happen to have identical dates. The combination has a closeReason that is the shortest of the two rows' values, i.e. "REPAIR" rather than "HIGHER_LEVEL_ALERT", or is there some other basis for the choice?
– HABO
Jun 26 at 21:46


alertlevel


closeReason









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