SELECT FROM_UNIXTIME(add_time, %Y-%m-%d) AS date, sum(price), user_idFROM ryc_order_courseWHERE add_time ! GROUP BY date, user_id 转载于:https://www.cnblogs.com/guolc/p/9934557.html
【题目】 A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference (if one exists) may be either positive or negative. A sequence with fewer than t…