Question: 4. Write a SELECT statement that returns these two columns: category_name The category_name column from the Categories table product_id The product_id column from the Products

4. Write a SELECT statement that returns these two columns: category_name The category_name column from the Categories table product_id The product_id column from the Products table Return one row for each category that has never been used. Hint: Use an outer join and only return rows where the product_id column contains a null value

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