SQL从日期范围中选择

Question

我有一个包含开始时间，停止时间和MAC地址的RADIUS会话记录表。我有一个要求，收集两个时间范围内联机的用户列表。我相信，在与下面的查询的时间范围内，我让所有用户的列表在线：

SELECT s_session_id, s_start_time, s_stop_time, s_calling_station_id 
FROM sessions 
WHERE (
    ("2015-10-01 08:00:00" BETWEEN s_start_time AND s_stop_time OR "2015-10-01 08:30:00" BETWEEN s_start_time AND s_stop_time) 
    OR 
    ("2015-10-01 12:00:00" BETWEEN s_start_time AND s_stop_time OR "2015-10-01 12:30:00" BETWEEN s_start_time AND s_stop_time) 
) 
ORDER BY s_start_time; 

但下一步，在都时期隔离细节只有那些用户在线时，躲避我。我得到最接近的是

GROUP BY s_calling_station_id HAVING COUNT(s_calling_station_id) > 1 

但这并没有提供我所有的会议的细节。

小提琴是在这里：http://sqlfiddle.com/#!9/1df471/1

感谢任何帮助！

Answer 1

尽管这个问题已经有一个公认的答案，我想添加这个（它避免了重复和拉从符合条件的所有会话的会话表中的数据）：

首先，创建包含过滤后的数据（即具有两个间隔连接的MAC地址的表：

create table temp_sessions 
select s1.s_calling_station_id 
    , if(@t1_1 between s1.s_start_time and s1.s_stop_time or @t1_2 between s1.s_start_time and s1.s_stop_time, s1.s_session_id, null) as s_1 
    , if(@t2_1 between s2.s_start_time and s2.s_stop_time or @t2_2 between s2.s_start_time and s2.s_stop_time, s2.s_session_id, null) as s_2 
from -- I use user variables because it will make easier to modify the time intervals if needed 
    (select @t1_1 := '2015-10-01 08:00:00', @t1_2 := '2015-10-01 08:30:00' 
      , @t2_1 := '2015-10-01 12:00:00', @t2_2 := '2015-10-01 12:30:00') as init 
    , sessions as s1 
    inner join sessions as s2 
      on s1.s_calling_station_id = s2.s_calling_station_id 
      and s1.s_session_id != s2.s_session_id 
having s_1 is not null and s_2 is not null; 

而现在，只需使用此表来获得你所需要的：

select sessions.* 
from sessions 
    inner join (
     select s_calling_station_id, s_1 as s_session_id 
     from temp_sessions 
     union 
     select s_calling_station_id, s_2 as s_session_id 
     from temp_sessions 
    ) as a using (s_calling_station_id, s_session_id); 

Here's the SQL fiddle

Answer 2

使用自联接。使用列别名，以便您可以使用不同的名称访问每个会话中的列。

SELECT s1.s_calling_station_id, 
    s1.s_session_id AS s1_session_id, s1.s_start_time AS s1_start_time, s1.s_stop_time AS s1_stop_time, 
    s2.s_session_id AS s2_session_id, s2.s_start_time AS s2_start_time, s2.s_stop_time AS s2_stop_time 
FROM sessions AS s1 
JOIN sessions AS s2 
    ON s1.s_calling_station_id = s2.s_calling_station_id 
     AND s1.s_session_id != s2.s_session_id 
WHERE ("2015-10-01 08:00:00" BETWEEN s1.s_start_time AND s1.s_stop_time OR "2015-10-01 08:30:00" BETWEEN s1.s_start_time AND s1.s_stop_time) 
    AND 
     ("2015-10-01 12:00:00" BETWEEN s2.s_start_time AND s2.s_stop_time OR "2015-10-01 12:30:00" BETWEEN s2.s_start_time AND s2.s_stop_time) 

DEMO