SQLQuokkaSQLQuokkaAmazon marketplace analysts monitor merchandise value across retail categories. Write a query to compute the total sales revenue generated in each product category. Include categories that have zero sales, reporting their total revenue as 0. Return `category_name` and `total_revenue` (calculated as quantity multiplied by unit_price). Sort results by `total_revenue DESC`, then by `category_name ASC` in case of ties.
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