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create table records (
user_id int,
amount int,
date date
);
insert into records values
(1, 10, '2021-05-01'),
(1, 10, '2021-05-02'),
(1, 10, '2021-05-03');
select date_trunc('month', to_date('2021-05-03', 'YYYY-MM-DD'));
select
sum(amount)
from
records
where
user_id = 1
and date_trunc('month', date) = date_trunc('month', to_date('2021-05-03', 'YYYY-MM-DD'));
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