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create table units( first_name varchar(10) not null, period_of_storage timestamp not null, finish_date int ); create or replace function get_finish_date() returns trigger as $$ begin new.finish_date := extract(day from current_date) - extract(day from new.period_of_storage); return new; end; $$ language plpgsql; create trigger update_finish_date before insert on units for each row execute function get_finish_date(); insert into units (first_name,period_of_storage) values ('one', '2023-03-19'), ('two', '2023-03-20'), ('three', '2023-03-21'); select * from units

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