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create table t (a date, b float); insert into t values ('2022-12-01', null), ('2023-01-01', 0.1), ('2023-02-01', 0.15), ('2023-03-01', 0.5), ('2023-04-01', 0.7), ('2023-05-01', 0.3); select a, b, ( 1000 * exp(sum(ln( coalesce(b, 1))) over (order by a)) )::numeric(5, 1) c from t
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