Hive综合案例练习（中级）第二十九题：求出商品连续售卖的时间区间

求出商品连续售卖的时间区间

题目需求

从订单详情表（order_detail）中，求出商品连续售卖的时间区间

结果如下（截取部分）：

Sku_id（商品id）	Start_date（起始时间）	End_date（结束时间）
1	2021-09-27	2021-09-27
1	2021-09-30	2021-10-01
1	2021-10-03	2021-10-08
10	2021-10-02	2021-10-03
10	2021-10-05	2021-10-08
11	2021-10-02	2021-10-08
12	2021-09-30	2021-09-30
12	2021-10-02	2021-10-06
12	2021-10-08	2021-10-08

代码实现

• 每个商品售卖的日期以及拿到按排序后日期的差值

select sku_id,
       create_date,
       date_sub(create_date, rank() over (partition by sku_id order by create_date)) ddrk
from order_detail
group by sku_id, create_date;

• 拿到每次售卖的区间

select distinct sku_id,
                first_value(t1.create_date)
                            over (partition by t1.sku_id,t1.ddrk order by t1.create_date rows between unbounded preceding and unbounded following) start_date,
                last_value(t1.create_date)
                           over (partition by t1.sku_id,t1.ddrk order by t1.create_date rows between unbounded preceding and unbounded following)  end_date
from (
         select sku_id,
                create_date,
                date_sub(create_date, rank() over (partition by sku_id order by create_date)) ddrk
         from order_detail
         group by sku_id, create_date
     ) t1