group by - Aggregating in SQL - Multiple Criteria -


this follow-up question aggregating in sql

i have table below.

conversion_date     user_name     last_date_touch     touch_count       7/15/2017                       6/17/2017               1       7/16/2017             b           6/24/2017               2       7/19/2017                       6/20/2017               1       7/19/2017             c           6/29/2017               1

grouped conversion_date , user_name, sum of touch_count looking 30 days conversion date but @ same time keeping last_date_touch within 30 day window of conversion_date.

for example, if 30 days conversion_date = 7/19/2017, cannot take sum of touch_count 30 day window below because include first row has last_date_touch out of 30 day window of conversion date.

this attempt, don't think takes account last_date_touch being in 30 day window. 

select      a.user_name     ,a.conversion_date     ,sum(b.touch_count) sumover30days     sometable     left join         sometable b on         b.user_name = a.user_name         , cast(b.conversion_date date) <= cast(a.conversion_date date)          , cast(b.conversion_date date) >= cast(dateadd(day,-30,a.conversion_date) date) group a.user_name, a.conversion_date

thanks!


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