1596.每位顾客最经常订购的商品-力扣（LeetCode）目标输入表：Productsproduct_idproduct_nameprice1keyboard1202mouse803screen6004harddisk450表：Ordersorder_idorder_datecustomer_idproduct_id12020/7/311122020/7/302232020/8/293342020/7/294152020/6/101262020/8/1