SELECT COUNT(*) FROM Products_for_hire WHERE NOT product_id IN (SELECT product_id FROM products_booked WHERE booked_amount > 200)
CREATE TABLE products_booked (product_id VARCHAR, booked_amount INTEGER); CREATE TABLE Products_for_hire (product_id VARCHAR, booked_amount INTEGER)
มีสินค้าจำนวนเท่าใดที่ไม่เคยจองด้วยจำนวนที่สูงกว่า 200
How many products are never booked with amount higher than 200?