sql - GROUP BY next months over N years -

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i need aggregate amounts grouped "horizon" 12 next months on 5 year:
assuming 2015-08-15

sum amount  0 12 next months (from 2015-08-16 2016-08-15) sum amount 12 24 next months (from 2016-08-16 2017-08-15) sum amount 24 36 next months ... sum amount 36 48 next months sum amount 48 60 next months

here fiddled dataset example:

+----+------------+--------+ | id | date       | amount | +----+------------+--------+ |  1 | 2015-09-01 |     10 | |  2 | 2015-10-01 |     10 | |  3 | 2016-10-01 |     10 | |  4 | 2017-06-01 |     10 | |  5 | 2018-06-01 |     10 | |  6 | 2019-05-01 |     10 | |  7 | 2019-04-01 |     10 | |  8 | 2020-04-01 |     10 | +----+------------+--------+

here expected result:

+---------+--------+ | horizon | amount | +---------+--------+ |       1 |     20 | |       2 |     20 | |       3 |     10 | |       4 |     20 | |       5 |     10 | +---------+--------+

how can these 12 next months grouped "horizons" ?

i tagged postgresql i'm using orm it's find idea. (by way don't have access date formatting functions)

i split 12 months time frame , group this:

select   floor(       (extract(epoch date) - extract(epoch now()))         / extract(epoch interval '12 month')     ) + 1 "horizon",   sum(amount) "amount" dataset  group horizon order horizon;

sql fiddle

inspired by: postgresql sql group time interval arbitrary accuracy (down milli seconds)


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