oracle - SQL Aggregate on Two tables -


table has millions of records 2014, using oracle

id   sales_amount  sales_date 1      10           20/11/2014 1      10           22/11/2014 1      10           22/12/2014 1      10           22/01/2015      1      10           22/02/2015          1      10           22/03/2015      1      10           22/04/2015      1      10           22/05/2015  1      10           22/06/2015      1      10           22/07/2015 1      10           22/08/2015 1      10           22/09/2015     1      10           22/10/2015      1      10           22/11/2015

table b

id   id_date 1    22/11/2014 2    01/12/2014

i want sum of totals 6 months 1 year id 1 taking starting
date table b 22/11/2014

output sales_amount_6months sales_amount_6months 1               70                 130

shall use add_months in case?

yes, can use add_months() , conditional aggregation :

select b.id,        sum(case when a.sales_date between b.id_date , add_months(b.id_date,6) a.sales_amount else 0 end) sales_6_month,        sum(case when a.sales_date between b.id_date , add_months(b.id_date,12) a.sales_amount else 0 end) sales_12_month tableb b join tablea  on(b.id = a.id) group b.id

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