表: Customer+---------------+---------+|ColumnName|Type|+---------------+---------+|customer_id|int||name|varchar||visited_on|date||amount|int|+---------------+---------+在SQL中，(customer

1321.餐馆营业额变化增长SQL架构表:Customer+---------------+---------+|ColumnName|Type|+---------------+---------+|customer_id|int||name|varchar||visited_on|date||amount|int|+-------------

【题目】表:Customer+---------------+---------+|ColumnName  |Type   |+---------------+---------+|customer_id  |int    ||name         |varchar||visited_on   |date   ||amount       |int    |+-----------

leetcode1321餐館營業額變化增長selectdistinctc2.visited_on,(selectsum(amount)fromCustomerc1wherec1.visited_on<=c2.visited_onandc1.visited_on>=date_sub(c2.visited_on,interval6day))asamount,round((selectsum(amount)fromCustomerc1

棋盘问题TimeLimit:1000MS MemoryLimit:10000KTotalSubmissions:125427 Accepted:56304Description在一个给定形状的棋盘（形状可能是不规则的）上面摆放棋子，棋子没有区别。要求摆放时任意的两个棋子不能放在棋盘中的同一行或者同一列，请编程求解对于给定形状和大小的棋盘