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create table moneytable(id_number, fiscal_year, amount) as ( select 1, 2015, 10 from dual union all select 1, 2014, 20 from dual union all select 1, 2013, 30 from dual union all select 1, 2012, 40 from dual union all select 1, 2011, 50 from dual );
5 rows affected
with y(rn, amt) as ( select row_number() over (order by fiscal_year desc), sum(amount) from moneytable g where id_number = 1 and fiscal_year between extract (year from sysdate) - 8 and extract(year from sysdate) - 1 group by fiscal_year), c(rn, amt, prev, ret) as ( select rn, amt, amt, 1 from y where rn = 1 union all select y.rn, y.amt, c.amt, (c.amt/y.amt)*ret from c join y on y.rn = c.rn + 1) select ret from c where rn = (select max(rn) from c)
RET
.2000000000000000000000000000000000000001