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淘宝联盟的网站怎么自己做,wordpress thread comment,国际新闻头条最新24小时,网页后端开发目录 1 题目2 建表语句3 题解 题目来源#xff1a;字节跳动。 1 题目 现有订单表t_order#xff0c;包含订单ID#xff0c;订单时间,下单用户#xff0c;当前订单是否有效#xff0c;请查询出每个用户每笔订单的上一笔有效订单

—————————————-… 目录 1 题目2 建表语句3 题解 题目来源字节跳动。 1 题目 现有订单表t_order包含订单ID订单时间,下单用户当前订单是否有效请查询出每个用户每笔订单的上一笔有效订单

| ord_id | ord_time | user_id | is_valid |

| 1 | 2023-12-11 12:01:03 | a | 1 | | 2 | 2023-12-11 12:02:06 | a | 0 | | 3 | 2023-12-11 12:03:15 | a | 0 | | 4 | 2023-12-11 12:04:20 | a | 1 | | 5 | 2023-12-11 12:05:03 | a | 1 | | 6 | 2023-12-11 12:01:02 | b | 1 | | 7 | 2023-12-11 12:03:03 | b | 0 | | 8 | 2023-12-11 12:04:01 | b | 1 | | 9 | 2023-12-11 12:07:03 | b | 1 |

—————————————————-期望查询结果如下

| ord_id | ord_time | user_id | is_valid | last_valid_ord_id |

| 1 | 2023-12-11 12:01:03 | a | 1 | NULL | | 2 | 2023-12-11 12:02:06 | a | 0 | 1 | | 3 | 2023-12-11 12:03:15 | a | 0 | 1 | | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 6 | 2023-12-11 12:01:02 | b | 1 | NULL | | 7 | 2023-12-11 12:03:03 | b | 0 | 6 | | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | ————————————————————————2 建表语句 –建表语句 create table t_order ( ord_id bigint COMMENT 订单ID, ord_time string COMMENT 订单时间, user_id string COMMENT 用户, is_valid bigint COMMENT 订单是否有效 ) COMMENT 订单记录表 stored as orc ; – 数据插入 insert into t_order(ord_id,ord_time,user_id,is_valid) values (1,2023-12-11 12:01:03,a,1), (2,2023-12-11 12:02:06,a,0), (3,2023-12-11 12:03:15,a,0), (4,2023-12-11 12:04:20,a,1), (5,2023-12-11 12:05:03,a,1), (6,2023-12-11 12:01:02,b,1), (7,2023-12-11 12:03:03,b,0), (8,2023-12-11 12:04:01,b,1), (9,2023-12-11 12:07:03,b,1);3 题解 1先查询出有效订单然后计算出每笔有效订单的上一单有效订单 select ord_id,ord_time,user_id,is_valid,lag(ord_id) over (partition by user_id order by ord_time asc) as last_valid_ord_id

from (select ord_id,ord_time,user_id,is_validfrom t_orderwhere is_valid 1) t执行结果

| ord_id | ord_time | user_id | is_valid | last_valid_ord_id |

| 1 | 2023-12-11 12:01:03 | a | 1 | NULL | | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 6 | 2023-12-11 12:01:02 | b | 1 | NULL | | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | ————————————————————————2原始的明细数据与新的有效订单表按照用户进行关联有效订单表的订单时间大于等于原始订单表 with tmp as (– 有效订单及其上一单有效记录select ord_id,ord_time,user_id,is_valid,lag(ord_id) over (partition by user_id order by ord_time asc) as last_valid_ord_idfrom (select ord_id,ord_time,user_id,is_validfrom t_orderwhere is_valid 1) t) select t1.,t2. from t_order t1 left join tmp t2 on t1.user_id t2.user_id

where t1.ord_time t2.ord_time执行结果

| t1.ord_id | t1.ord_time | t1.user_id | t1.is_valid | t2.ord_id | t2.ord_time | t2.user_id | t2.is_valid | t2.last_valid_ord_id |

| 1 | 2023-12-11 12:01:03 | a | 1 | 1 | 2023-12-11 12:01:03 | a | 1 | NULL | | 1 | 2023-12-11 12:01:03 | a | 1 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 2 | 2023-12-11 12:02:06 | a | 0 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 3 | 2023-12-11 12:03:15 | a | 0 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 4 | 2023-12-11 12:04:20 | a | 1 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | | 1 | 2023-12-11 12:01:03 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 2 | 2023-12-11 12:02:06 | a | 0 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 3 | 2023-12-11 12:03:15 | a | 0 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 4 | 2023-12-11 12:04:20 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 5 | 2023-12-11 12:05:03 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | | 6 | 2023-12-11 12:01:02 | b | 1 | 6 | 2023-12-11 12:01:02 | b | 1 | NULL | | 6 | 2023-12-11 12:01:02 | b | 1 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | | 7 | 2023-12-11 12:03:03 | b | 0 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | | 8 | 2023-12-11 12:04:01 | b | 1 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | | 6 | 2023-12-11 12:01:02 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | | 7 | 2023-12-11 12:03:03 | b | 0 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | | 8 | 2023-12-11 12:04:01 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | | 9 | 2023-12-11 12:07:03 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | ————————————————————————————————————————————————-3使用row_number原始订单记录表中的user_id、ord_id进行分组按照有效订单表的时间排序增加分组排序 with tmp as (– 有效订单及其上一单有效记录select ord_id,ord_time,user_id,is_valid,lag(ord_id) over (partition by user_id order by ord_time asc) as last_valid_ord_idfrom (select ord_id,ord_time,user_id,is_validfrom t_orderwhere is_valid 1) t) select t1.,t2.,row_number() over (partition by t1.ord_id,t1.user_id order by t2.ord_time asc) as rn from t_order t1 left join tmp t2 on t1.user_id t2.user_id

where t1.ord_time t2.ord_time执行结果

| t1.ord_id | t1.ord_time | t1.user_id | t1.is_valid | t2.ord_id | t2.ord_time | t2.user_id | t2.is_valid | t2.last_valid_ord_id | rn |

| 1 | 2023-12-11 12:01:03 | a | 1 | 1 | 2023-12-11 12:01:03 | a | 1 | NULL | 1 | | 1 | 2023-12-11 12:01:03 | a | 1 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | 2 | | 1 | 2023-12-11 12:01:03 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 3 | | 2 | 2023-12-11 12:02:06 | a | 0 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | 1 | | 2 | 2023-12-11 12:02:06 | a | 0 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 2 | | 3 | 2023-12-11 12:03:15 | a | 0 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | 1 | | 3 | 2023-12-11 12:03:15 | a | 0 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 2 | | 4 | 2023-12-11 12:04:20 | a | 1 | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | 1 | | 4 | 2023-12-11 12:04:20 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 2 | | 5 | 2023-12-11 12:05:03 | a | 1 | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 1 | | 6 | 2023-12-11 12:01:02 | b | 1 | 6 | 2023-12-11 12:01:02 | b | 1 | NULL | 1 | | 6 | 2023-12-11 12:01:02 | b | 1 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | 2 | | 6 | 2023-12-11 12:01:02 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | 3 | | 7 | 2023-12-11 12:03:03 | b | 0 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | 1 | | 7 | 2023-12-11 12:03:03 | b | 0 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | 2 | | 8 | 2023-12-11 12:04:01 | b | 1 | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | 1 | | 8 | 2023-12-11 12:04:01 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | 2 | | 9 | 2023-12-11 12:07:03 | b | 1 | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | 1 | ——————————————————————————————————————————————————4去除冗余字段筛选rn1 的记录 with tmp as (– 有效订单及其上一单有效记录select ord_id,ord_time,user_id,is_valid,lag(ord_id) over (partition by user_id order by ord_time asc) as last_valid_ord_idfrom (select ord_id,ord_time,user_id,is_validfrom t_orderwhere is_valid 1) t) select * from (select t1.*,t2.last_valid_ord_id,row_number() over (partition by t1.ord_id,t1.user_id order by t2.ord_time asc) as rnfrom t_order t1left join tmp t2on t1.user_id t2.user_idwhere t1.ord_time t2.ord_time) tt

where rn 1执行结果

| tt.ord_id | tt.ord_time | tt.user_id | tt.is_valid | tt.last_valid_ord_id | tt.rn |

| 1 | 2023-12-11 12:01:03 | a | 1 | NULL | 1 | | 2 | 2023-12-11 12:02:06 | a | 0 | 1 | 1 | | 3 | 2023-12-11 12:03:15 | a | 0 | 1 | 1 | | 4 | 2023-12-11 12:04:20 | a | 1 | 1 | 1 | | 5 | 2023-12-11 12:05:03 | a | 1 | 4 | 1 | | 6 | 2023-12-11 12:01:02 | b | 1 | NULL | 1 | | 7 | 2023-12-11 12:03:03 | b | 0 | 6 | 1 | | 8 | 2023-12-11 12:04:01 | b | 1 | 6 | 1 | | 9 | 2023-12-11 12:07:03 | b | 1 | 8 | 1 |