计算MySQL中最后一行的总持续时间 [英] Calculate the total time duration on last row in mysql

问题描述

我有这个mysql查询:

I have this mysql query:

SELECT CONCAT(u.lastname, ', ', u.firstname) AS Name, start.timestamp start, end.timestamp end, timediff(end.timestamp, start.timestamp) duration 
    from user u, user_group ug, (
    select *, (
        select event_id from event L2 where L2.timestamp>L1.timestamp and L2.user_bannerid=L1.user_bannerid order by timestamp limit 1
    ) stop_id from event L1
) start join event end on end.event_id=start.stop_id
where start.status='In' and end.status='Out' and u.user_bannerid = start.user_bannerid and ug.user_bannerid = u.user_bannerid  and ug.group_id = start.group_id 

它显示了这样的内容:

+----------------------------------------------------+---------------+
| Name   | start               | end                 | duration      |    
+----------------------------------------------------+---------------+
| User   | 2011-11-24 02:12:05 | 2011-11-24 02:12:20 | 00:00:15      |       
| User   | 2011-11-28 21:46:54 | 2011-11-28 21:53:01 | 00:06:17      |
+----------------------------------------------------+---------------+

但是我希望最后一行显示持续时间的总数，例如:

But i want the last row to show the total number of duration like:

+----------------------------------------------------+---------------+
| Name   | start               | end                 | duration      |    
+----------------------------------------------------+---------------+
| User   | 2011-11-24 02:12:05 | 2011-11-24 02:12:20 | 00:00:15      |       
| User   | 2011-11-28 21:46:54 | 2011-11-28 21:53:01 | 00:06:17      |
|        |                     |                     | 00:06:32      |
+----------------------------------------------------+---------------+

有人可以帮我修改查询，以在下一行显示持续时间总和吗?

Can someone please help me modify the query to show sum of the duration on the next row?

推荐答案

我对这个答案并不感到骄傲，但它应该可以工作:

I'm not super proud of this answer, but it should work:

SELECT 0 as is_total, CONCAT(u.lastname, ', ', u.firstname) AS Name, start.timestamp start, end.timestamp end, timediff(end.timestamp, start.timestamp) duration 
    from user u, user_group ug, (
    select *, (
        select event_id from event L2 where L2.timestamp>L1.timestamp and L2.user_bannerid=L1.user_bannerid order by timestamp limit 1
    ) stop_id from event L1
) start join event end on end.event_id=start.stop_id
where start.status='In' and end.status='Out' and u.user_bannerid = start.user_bannerid and ug.user_bannerid = u.user_bannerid  and ug.group_id = start.group_id 

UNION
SELECT 1, null, null, null, sum(duration)
FROM
(
    SELECT CONCAT(u.lastname, ', ', u.firstname) AS Name, start.timestamp start, end.timestamp end, timediff(end.timestamp, start.timestamp) duration 
        from user u, user_group ug, (
        select *, (
            select event_id from event L2 where L2.timestamp>L1.timestamp and L2.user_bannerid=L1.user_bannerid order by timestamp limit 1
        ) stop_id from event L1
    ) start join event end on end.event_id=start.stop_id
    where start.status='In' and end.status='Out' and u.user_bannerid = start.user_bannerid and ug.user_bannerid = u.user_bannerid  and ug.group_id = start.group_id 

) total
ORDER BY is_total

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