SQLQuokkaSQLQuokkaAmazon Category Managers identify best-performing merchandise across catalog categories. Write a SQL query using the `DENSE_RANK()` window function to find the top-selling product in each product category by total units sold. If multiple products in the same category are tied for the highest units, return all tied products. Return `category_name`, `product_id`, `product_name`, and `total_units_sold`. Order the final output by `category_name ASC`, then `product_id ASC`. Note: Window function support requires DuckDB / full SQL engine capabilities. This question is staged for the upcoming DuckDB browser engine.
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