对顾客ID和日期排序_牛客题霸

有Orders表 cust_id order_num order_date andy aaaa 2021-01-01 00:00:00 andy bbbb 2021-01-01 12:00:00 bob cccc 2021-01-10 12:00:00 dick dddd 2021-01-11 00:00:00 【问题】编写 SQL 语句，从 Orders 表中检索顾客 ID（cust_id）和订单号（order_num），并先按顾客 ID 对结果进行排序，再按订单日期倒序排列。【示例答案】返回2列，cust_id和order_num cust_id order_num andy bbbb andy aaaa bob cccc dick dddd 【示例解析】首先根据cust_id进行排列，andy在bob和dick前，再根据order_date进行排列，订单号bbbb的订单时间是 "2021-01-01 12:00:00"大于订单号aaaa的时间"2021-01-01 00:00:00"

示例1

输入

DROP TABLE IF EXISTS `Orders`;
CREATE TABLE IF NOT EXISTS `Orders` (
  `cust_id` varchar(255) NOT NULL COMMENT '顾客 ID',
  `order_num` varchar(255) NOT NULL COMMENT '订单号',
  `order_date` timestamp NOT NULL COMMENT '订单时间'
);
INSERT INTO `Orders` VALUES ('andy','aaaa','2021-01-01 00:00:00'),
('andy','bbbb','2021-01-01 12:00:00'),
('bob','cccc','2021-01-10 12:00:00'),
('dick','dddd','2021-01-11 00:00:00');

输出

andy|bbbb
andy|aaaa
bob|cccc
dick|dddd