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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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