SQL Joining/merging两个事件表，对对应时间敏感

Question

表 1 有开放时间。

id |  OpenTime
1  | 2019-12-02 16:52:42.9130000
1  | 2019-12-02 16:55:57.5560000
1  | NULL
1  | 2019-12-02 16:59:09.5640000
1  | 2019-12-02 17:01:35.3510000
2  | 2019-12-02 17:02:55.0270000
2  | 2019-12-02 17:05:41.3930000
2  | 2019-12-02 17:07:41.7870000

表 2 有关闭时间。

id |  CloseTime
1  | NULL
1  | 2019-12-02 16:56:19.2560000
1  | 2019-12-02 16:57:47.5790000
1  | 2019-12-02 16:59:33.5390000
1  | 2019-12-02 17:01:55.6040000
2  | 2019-12-02 17:04:00.7780000
2  | 2019-12-02 17:06:04.4830000

我需要为每个打开到关闭时间进行DATEDIFF 计算。

一次只能打开一次，但是我们可能会错过该活动。

我们可能还没有结束活动。

一个 OpenTime 通常会有一个对应的 CloseTime，其中 CloseTime 大于 OpenTime，但小于下一个 OpenTime。

id |  OpenTime                    | CloseTime                    | Datedif
1  | 2019-12-02 16:52:42.9130000  | NULL                         | NULL
1  | 2019-12-02 16:55:57.5560000  | 2019-12-02 16:56:19.2560000  | 
1  | NULL                         | 2019-12-02 16:57:47.5790000  | NULL
1  | 2019-12-02 16:59:09.5640000  | 2019-12-02 16:59:33.5390000  | 
1  | 2019-12-02 17:01:35.3510000  | 2019-12-02 17:01:55.6040000  | 
2  | 2019-12-02 17:02:55.0270000  | 2019-12-02 17:04:00.7780000  | 
2  | 2019-12-02 17:05:41.3930000  | 2019-12-02 17:06:04.4830000  | 
2  | 2019-12-02 17:07:41.7870000  | NULL                         | NULL

Datediff 只需几秒钟即可DATEDIFF(SECOND,OpenTime,CloseTime)。

DROP TABLE IF EXISTS #NEWTABLE;
SELECT 
  a.ID,
  MAX(a.OpenTime) as OpenTime,
  MIN(b.CloseTime) as CloseTime ,
  DATEDIFF(SECOND, a.OpenTime, b.CloseTime) AS diffSeconds
INTO #NEWTABLE
FROM Table1  a
JOIN Table2 b
  ON a.Id= b.Id
WHERE 
a.Id = b.ID
and b.CloseTime> = a.OpenTime

Group by a.Id,DATEDIFF(SECOND, a.OpenTime, b.CloseTime)
order by diffSeconds desc

这不起作用，但我已尝试确保获得每个 OpenTime 的正确对应 CloseTime。我的代码为 8 个打开和关闭事件提供了 26 行输出。

Answer 1

您可以使用LEAD查找下一个开放时间并从table2中获取相应的记录

with cte as(
select id, opentime, lead(opentime,1) over (order by opentime) nextopentime
from table1
where opentime is not null)
select a.id, a.opentime, b.closetime
from cte a 
    left join table2 b on a.id = b.id and b.closetime > a.opentime and b.closetime < a.nextopentime
order by a.opentime