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Select title,c.name as category,f.rental_rate as rental_rate, avg(f.rental_rate) over (partition by c.name) as category_avg_rental_rate from film as f left join film_category as fc on fc.film_id=f.film_id left join category c on c.category_id=fc.category_id left join inventory as i on f.film_id=i.film_id --left join rental as r on i.inventory_id=r.inventory_id --left join payment as p on r.customer_id=p.customer_id and r.rental_id=p.rental_id

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