MySQL

Question

所以，我有一个计时系统 table，它跟踪我的员工花费多少时间登录到不同的状态。看起来是这样的：

Employee_ID     Queue             StartTime            End Time
   121509      'Break'      2018-05-17 13:31:54  2018-05-17 13:47:02
   121509      'Working'    2018-05-17 13:47:04  2018-05-17 15:05:45
   121509      'Unavail.'   2018-05-17 15:05:46  2018-05-17 15:32:01

等等。我的目标是汇总所有员工在每个队列状态中花费的时间（通过从 EndTime 中减去 StartTime 得到）并按十五分钟的间隔对该汇总进行分组。我是做的是这样的：

concat(
    time_format(convert_tz(StartTime,'UTC','America/Denver'),'%H'),
    ':',
    case
        when minute(convert_tz(StartTime,'UTC','America/Denver')) < 15
            then '00'
        when minute(convert_tz(StartTime,'UTC','America/Denver')) < 30
            then '15'
        when minute(convert_tz(StartTime,'UTC','America/Denver')) < 45
            then '30'
        else '45'
    end,
    ':00'
) as 'Interval',

但是，通过以这种方式分组，我意识到如果我以这种方式分组，那么在队列中花费的任何时间都将仅计入员工记录的 第一个 间隔成，而不是将时间分成 StartTime 和 Endtime 之间的时间范围所包含的所有时间间隔。

所以，我的问题是：如何对我的数据进行分组，以便如果给定的时间范围超过它开始时的十五分钟间隔，它就会开始计算 下一个十五分钟的间隔？

示例输出：

Employee_ID   Interval      Queue    QueueTime
   121509        13:30      'Break'   00:14:54
   121509        13:45      'Break'   00:02:02
   121509        13:45     'Working'  00:13:58
   121509        14:00     'Working'  00:15:00
   121509        14:15     'Working'  00:15:00
   121509        14:30     'Working'  00:02:58
   121509        14:30     'Unavail.' 00:08:13
   121509        14:30     'Break'    00:03:28

Answer 1

我猜您会想要获取时间戳差异，然后按员工和队列类型分组。像这样的查询应该适合您：

SELECT 
    Employee_ID,
    Queue,
    SUM(TIMESTAMPDIFF(MINUTE,
        StartTime,
        EndTime)) AS Time
FROM
    EmployeeTable
GROUP BY Employee_ID , Queue;

Answer 2

好的。这花了一些时间，但我在 RToyo 的帮助下弄明白了：

首先：创建一个包含十五分钟间隔的列表：

        select 
        addtime(time('00:00:00'),sec_to_time(900 * (a.a + b.a * 10))) as 'IntervalStart',
        addtime(time('00:14:59'),sec_to_time(900 * (a.a + b.a * 10))) as 'IntervalEnd'
    from (
        select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
        cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
    where
        addtime(time('00:00:00'),sec_to_time(900 * (a.a + b.a * 10))) between '06:00:00' and '18:45:00'

接下来：通过测试 StartTime 和 Endtime 字段之间的重叠来加入计时 table：

left join (     select 
        addtime(time('00:00:00'),sec_to_time(900 * (a.a + b.a * 10))) as 'Interval Start',
        addtime(time('00:14:59'),sec_to_time(900 * (a.a + b.a * 10))) as 'Interval End'
    from (
        select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
        cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
    where
        addtime(time('00:00:00'),sec_to_time(900 * (a.a + b.a * 10))) between '06:00:00' and '18:45:00') as Intervals
on timekeepingtable.StartTime <= Intervals.IntervalStart
and timekeepingtable.EndTime >= Intervals.IntervalEnd

然后只需将 StartTime 和 EndTime 字段修改为以间隔为界：

        if(time(pgrp.StartTime) < Intervals.IntervalStart,Intervals.IntervalStart,time(pgrp.StartTime)) as 'Start Time',
    if(time(pgrp.EndTime) > Intervals.IntervalEnd, Intervals.IntervalEnd,time(pgrp.EndTime)) as 'End Time',

MySQL - 按十五分钟间隔对时间范围进行分组

MySQL - Grouping Time Ranges by Fifteen Minute Intervals

sql

time

intervals