Table schema:
CREATE TABLE products (product_name VARCHAR, product_id VARCHAR); CREATE TABLE order_items (order_quantity INTEGER, product_id VARCHAR)

Question: Show the product name and total order quantity for each product.
SQL: SELECT T1.product_name, SUM(T2.order_quantity) FROM products AS T1 JOIN order_items AS T2 ON T1.product_id = T2.product_id GROUP BY T1.product_id