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create table film_screenings ( id serial primary key, film int references films(id), -- фильм hall int references halls(id), -- кинозал screening_time tzrange, -- дата и время начала сеанса recomended_price numeric, -- рекомендованная цена билета constraint no_screening_time_overlap exclude using gist ( screening_time WITH && -- check for overlapping ranges ) );

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