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create table transactions (date_details DATE, prod_id varchar(2), qty int); insert into transactions(date_details, prod_id, qty) values ('2021-01-01','U1',2), ('2021-02-01','U2',10), ('2021-02-01','U3',9), ('2021-03-01','U3',7), ('2021-03-01','U1',6), ('2021-01-01','U2',5); create table products (prod_id varchar(2), price int); insert into products(prod_id, price) values ('U1',200), ('U2',500), ('U3',100);
9 rows affected
with cte as( select MONTH(a.date_details) as month, sum(b.price*a.qty) as Rev from transactions a inner join products b on a.prod_id = b.prod_id group by MONTH(a.date_details) ), cte2 as( select month, Rev, lag(Rev,1) over(order by month) as prev_month from cte ) select month, (Rev-Prev_month) as extra_rev from cte2 where prev_month is not null
month
extra_rev
2
3000
3
-4000