CREATE TABLE customers (customer_id DECIMAL, customer_type_code TEXT, address_line_1 TEXT, address_line_2 TEXT, town_city TEXT, state TEXT, email_address TEXT, phone_number TEXT)
CREATE TABLE complaints (complaint_id DECIMAL, product_id DECIMAL, customer_id DECIMAL, complaint_outcome_code TEXT, complaint_status_code TEXT, complaint_type_code TEXT, date_complaint_raised TIME, date_complaint_closed TIME, staff_id DECIMAL)
CREATE TABLE products (product_id DECIMAL, parent_product_id DECIMAL, product_category_code TEXT, date_product_first_available TIME, date_product_discontinued TIME, product_name TEXT, product_description TEXT, product_price DECIMAL)
CREATE TABLE staff (staff_id DECIMAL, gender TEXT, first_name TEXT, last_name TEXT, email_address TEXT, phone_number TEXT)

Return the names of products that have had complaints filed by the customer who has filed the fewest complaints.
SELECT DISTINCT t1.product_name FROM products AS t1 JOIN complaints AS t2 ON t1.product_id = t2.product_id JOIN customers AS t3 GROUP BY t3.customer_id ORDER BY COUNT(*) LIMIT 1
SELECT DISTINCT "t1"."product_name" FROM "products" AS "t1" CROSS JOIN "customers" AS "t3" JOIN "complaints" AS "t2" ON "t1"."product_id" = "t2"."product_id" GROUP BY "t3"."customer_id" ORDER BY COUNT(*) NULLS FIRST LIMIT 1