query: SELECT order_id ,  count(DISTINCT product_id) FROM Order_items GROUP BY order_id
question: Are Showing order id and number product each order.
query_toks: SELECT order_id , count ( DISTINCT product_id ) FROM Order_items GROUP BY order_id
query_toks_no_value: select order_id , count ( distinct product_id ) from order_items group by order_id
question_toks: Are Showing order id and number product each order.