query: SELECT order_id ,  sum(product_quantity) FROM Order_items GROUP BY order_id
question: Show orders ids and the total quantitys in each orders.
query_toks: SELECT order_id , sum ( product_quantity ) FROM Order_items GROUP BY order_id
query_toks_no_value: select order_id , sum ( product_quantity ) from order_items group by order_id
question_toks: Show orders ids and the total quantitys in each orders.