如何获得的开始时间和结束时间为每个状态

我期待列出开始时间和结束时间当门被OPEN这个样本数据如何获得的开始时间和结束时间为每个状态

下面是一些示例数据表

currenttime,  door_status, 
12-10-15 12:02:00 Open 
12-10-15 12:01:00 Open 
12-10-15 12:00:30 Open 
12-10-15 11:59:30 Open 
12-10-15 11:59:00 Open 
12-10-15 11:58:30 Open 
12-10-15 11:58:00 Closed 
12-10-15 11:57:30 Closed 
12-10-15 11:57:00 Open 
12-10-15 11:56:00 Open 
12-10-15 11:55:30 Open 
12-10-15 11:55:00 Open

这里是预期的结果

start_Time    end_Time    time_it_was_open 

12-10-15 11:58:30  12-10-15 12:02:00  3 mins 30 secs 
12-10-15 11:55:00  12-10-15 11:57:00  2 mins

试图查询

查询1：

SELECT current_time_open, current_time_closed, door1 FROM(
SELECT 
    CASE 
     WHEN door1 = 'Open' THEN currenttime 
    END AS current_time_open, 
    CASE 
     WHEN door1 = 'Closed' THEN currenttime 
    END AS current_time_closed, 
    door1 
FROM 
    (SELECT 
     r1.currenttime, r1.temp, r1.door1 
    FROM 
     rcs_data r1) as g1 GROUP BY currenttime DESC) as t1;

查询2：

SELECT MAX(current_time_open), MAX(current_time_closed), TIMEDIFF(MAX(current_time_open),MAX(current_time_closed)) FROM (SELECT 
    CASE 
     WHEN door1 = 'Open' THEN currenttime 
    END AS current_time_open, 
    CASE 
     WHEN door1 = 'Closed' THEN currenttime 
    END AS current_time_closed 
FROM 
    (SELECT 
     currenttime, temp, door1 
    FROM 
     rcs_data) as g1 GROUP BY currenttime DESC) as t1;

来源

2015-10-13 Samuel Thampy

到目前为止您尝试过了什么？编辑您的问题并添加您的尝试查询。 – BrokenBinary

请添加一个“预期结果”区块，因为它可以帮助我们使用您的虚拟数据来达到您的期望。 –

我已经添加了。 @MarcoAurélioDeleu –

这里一个变种做到这一点：

select *, unix_timestamp(endtime)-unix_timestamp(starttime) as dur_seconds 
from (
select min(currenttime) as starttime, max(currenttime) as endtime 
from (
select currenttime, coalesce(
(select min(currenttime) from t as b where b.currenttime > a.currenttime and b.door_status != a.door_status), 
(select max(currenttime) from t as b where b.currenttime > a.currenttime and b.door_status = a.door_status), 
a.currenttime) as mxt 
from t as a 
where a.door_status = 'Open' 
) as q 
group by mxt 
) as q2

因此，主要想法是为“打开”状态组“分配”一些唯一ID，在这种特定情况下，其第一次关闭状态或最后一次打开状态，或当前时间为最后一次“打开” “表格中的状态

来源

2015-10-14 14:55:58

美丽，非常感谢@Lashane，它的工作原理 –

如何获得的开始时间和结束时间为每个状态

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