不带0的区间分组数据

Question

我有关注 table:

+---------------------+--------+----------+
| MeasureInterval     | Car_id | Distance |
+---------------------+--------+----------+
| 2020-12-15 17:00:00 | 1      | 20       |
+---------------------+--------+----------+
| 2020-12-15 17:05:00 | 1      | 30       |
+---------------------+--------+----------+
| 2020-12-15 17:10:00 | 1      | 17       |
+---------------------+--------+----------+
| 2020-12-15 17:15:00 | 1      | 0        |
+---------------------+--------+----------+
| 2020-12-15 17:20:00 | 1      | 0        |
+---------------------+--------+----------+
| 2020-12-15 17:25:00 | 1      | 10       |
+---------------------+--------+----------+
| 2020-12-15 17:30:00 | 1      | 15       |
+---------------------+--------+----------+
| 2020-12-15 17:35:00 | 1      | 0        |
+---------------------+--------+----------+
| 2020-12-15 17:40:00 | 1      | 0        |
+---------------------+--------+----------+
| 2020-12-15 17:45:00 | 1      | 0        |
+---------------------+--------+----------+

我正在尝试 select 汽车移动的连续间隔（忽略 Distance=0 的间隔），因此结果将类似于：

+---------------------+---------------------+--------+--------------+
|                     |                     |        |              |
| MeasureInterval_min | MeasureInterval_max | Car_id | Distance_sum |
+---------------------+---------------------+--------+--------------+
| 2020-12-15 17:00:00 | 2020-12-15 17:10:00 | 1      | 67           |
+---------------------+---------------------+--------+--------------+
| 2020-12-15 17:25:00 | 2020-12-15 17:30:00 | 1      | 25           |
+---------------------+---------------------+--------+--------------+

知道如何实现吗？

Answer 1

这是一个缺口和孤岛问题。岛屿是非零距离的相邻记录。

这是一种使用行号之间的差异来识别组的方法：

select 
    min(measureinterval) as measureinterval_min,
    max(measureinterval) as measureinterval_max,
    car_id,
    sum(distance) as distance
from (
    select t.*,
        row_number() over(partition by carid order by measureinterval) rn1,
        row_number() over(partition by carid, (distance = 0) order by measureinterval) rn2
    from mytable t
) t
where distance > 0
group by car_id, rn1 - rn2

不带0的区间分组数据

Group data in intervals without 0

mysql

sql

datetime

gaps-and-islands