Table schema:
CREATE TABLE Product_Suppliers (total_amount_purchased INTEGER, total_value_purchased INTEGER, supplier_id VARCHAR)

Question: What are the average amount purchased and value purchased for the supplier who supplies the most products.
SQL: SELECT AVG(total_amount_purchased), AVG(total_value_purchased) FROM Product_Suppliers WHERE supplier_id = (SELECT supplier_id FROM Product_Suppliers GROUP BY supplier_id ORDER BY COUNT(*) DESC LIMIT 1)