mysql在时间戳中两个表的重叠 [英] mysql overlaps of two tables in timestamps

问题描述

我在MySQL中有两个表.在这些表的每一个中，保存了具有其MAC地址和状态区域信息的设备.

I have two tables in MySQL. In each of these tables, devices with their MAC-Addresses and information of their states area saved.

这些状态确实在某些时间戳记(startTime，endTime)及其持续时间(endTime-startTime)处开始和结束，并且是由某些ID引起的.

These states do start and end at certain timestamps (startTime,endTime) and their durations (endTime-startTime), and are caused by certain id's.

现在，我想查找某些事件移动"和负载"之间的重叠部分，这些重叠部分以天为单位，如下所示:

Now i want to find the overlappings between the certain events "move" and "load" separated by days, like this:

sum of time, when movement took place (value in the fiddle: 421)
sum of time, when load took place (value in the fiddle: 520)
sum of time, when movement and load took place (value in the fiddle: 391)

查询结果应如下所示:

ID                  DATE                            ALL_MOVEMENT    ALL_LOAD    LOAD_MOVEMENT
00:50:c2:63:10:1a   October, 29 2012 00:00:00+0000  421             520         391
00:50:c2:63:10:1a   February, 22 2013 00:00:00+0000 421             520         391
00:50:c2:63:10:1b   February, 22 2013 00:00:00+0000 181             220         181

我在这里准备了一个小提琴: http://sqlfiddle.com/#!2/c210c

I have prepared a fiddle here: http://sqlfiddle.com/#!2/c210c

更新:可以在这里看到以不同的表结构提供我想要的东西的小提琴:

Update: A fiddle which offers the things i want in a different table structure can be seen here:

http://sqlfiddle.com/#!2/31b94/1

推荐答案

我不太了解数据集与结果集的关系，但在我看来，您或多或少需要这样的东西...

I don't really understand how the data set correlates with the result set but it seems to me you want something more or less like this...

 SELECT m.id
      , DATE(FROM_UNIXTIME(m.starttime))Date,SUM(m.duration) all_movement
      , SUM(l.duration) all_load
   FROM move_table m
   JOIN load_table l
     ON l.id = m.id
    AND l.endtime > m.starttime
    AND l.starttime < m.endtime
  GROUP 
     BY m.id
      , DATE(FROM_UNIXTIME(m.starttime));
 +-------------------+------------+--------------+----------+
 | id                | Date       | all_movement | all_load |
 +-------------------+------------+--------------+----------+
 | 00:50:c2:63:10:1a | 2012-10-29 |          391 |      520 |
 | 00:50:c2:63:10:1a | 2013-02-22 |          391 |      520 |
 | 00:50:c2:63:10:1b | 2013-02-22 |          181 |      220 |
 +-------------------+------------+--------------+----------+

偶然地，duration在这种情况下似乎是多余的，因为(例如)SUM(m.endtime-m.starttime)将为您提供相同的结果.

Incidentally, duration appears to be redundant in this context as (for instance) SUM(m.endtime-m.starttime) will get you the same result.

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