// Problem 03, query 02 - Successfully Sold Products
            var usersWithProductSales = context.Users
                .Where(u => u.SoldProducts.Any())
                .Select(u => new
                {
                    firstName = u.FirstName ?? "-",
                    lastName = u.LastName,
                    soldProducts = u.SoldProducts.Select(p => new
                    {
                        name = p.Name,
                        price = p.Price,
                        buyerFirstName = p.Buyer.FirstName ?? "-",
                        buyerLastName = p.Buyer.LastName
                    })
                });

// Problem 03, query 04 - Users and Products
            var usersWithSoldProducts = context.Users
                .Where(u => u.SoldProducts.Any())
                .OrderByDescending(u => u.SoldProducts.Count)
                .ThenBy(u => u.LastName)
                .Select(u => new
                {
                    firstName = u.FirstName ?? "-",
                    lastName = u.LastName,
                    age = u.Age,
                    products = u.SoldProducts.Select(p => new
                    {
                        name = p.Name,
                        price = p.Price
                    })
                });