Which items were ordered four or more times? | There is no item that was ordered four or more times | What is the id of products supplied more than 80000?
SELECT product_id FROM Product_Suppliers GROUP BY product_id HAVING sum ( total_amount_purchased )   >  80000
items ordered four or more times refers to COUNT(order) >= 4; id of products supplied more than 80000 refers to SUM(total_amount_purchased) > 80000;