sql server 2008 - cumulative totals based on condition -


i trying cumulative totals based on criteria. below dummy sample data set. cumulative time based on indicator id. when indicator continuously 1 same id, sum of duration. if becomes 0 restart.

id  duration    indicator   cumm_duration 1   30          0           30 1   30          1           60 1   30          0           30 1   30          0           30 1   30          1           60 1   30          0           30 1   30          0           30 1   30          0           30 1   30          0           30 1   30          0           30 1   30          0           30 1   30          0           30 1   30          1           60 1   30          1           90 2   30          1           30 2   30          0           30 2   30          0           30 2   30          0           30 2   30          1           60 2   30          0           30 2   30          1           60 2   30          0           30 2   30          0           30 2   30          0           30 2   30          1           60 2   30          1           90 2   30          0           30

data:

declare @t table     (       id int ,       duration int ,       indicator int     ) insert  @t values  ( 1, 30, 0 ),         ( 1, 30, 1 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 1 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 0 ),         ( 1, 30, 1 ),         ( 1, 30, 1 ),         ( 2, 30, 1 ),         ( 2, 30, 0 ),         ( 2, 30, 0 ),         ( 2, 30, 0 ),         ( 2, 30, 1 ),         ( 2, 30, 0 ),         ( 2, 30, 1 ),         ( 2, 30, 0 ),         ( 2, 30, 0 ),         ( 2, 30, 0 ),         ( 2, 30, 1 ),         ( 2, 30, 1 ),         ( 2, 30, 0 );

solution1(bruteforce):

with    indexed           ( select   * ,                         row_number() on ( order ( select null ) ) rn                    @t              ),         recursion           ( select   * ,                         duration cumulative                    indexed                   rn = 1                union                select   t.* ,                         case when t.indicator = 1 , t.id = r.id                              r.cumulative + t.duration                              else t.duration                         end                    indexed t                         join recursion r on r.rn + 1 = t.rn              )     select  *    recursion     option  ( maxrecursion 0 )

solution2:

with indexed (select *, row_number() on (order (select null)) rn @t) select *,        (select sum(duration) indexed i2         i1.id = i2.id , i2.rn <= i1.rn ,                i2.rn >= isnull((select top 1 i3.rn indexed i3                                i3.indicator = 0 , i3.rn <= i1.rn                                order i3.rn desc), 0)) indexed i1

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