CodeRankGPT -
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In a typical e-commerce database, there are tables for products and invoices. Each invoice contains one or more items, each of which corresponds to a product. The problem at hand is to identify those products that have not been sold yet. This is done by checking if the product's id is present in the invoice items table. If it is not, then the product has not been sold.
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The solution uses a subquery to find all product ids that are present in the invoice items table. This list is then used in the main query to filter out products that have been sold. The result is a list of products that have not been sold. The second solution is similar to the first one, but it also groups the results by product sku and product name, and orders them by product sku in ascending order.
SELECT product.sku, product.product_name FROM product WHERE product.id NOT IN (SELECT product_id FROM invoice_item); SELECT product.sku, product.product_name FROM product WHERE product.id NOT IN (SELECT product_id FROM invoice_item) GROUP BY 1,2 ORDER BY product.sku ASC;
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