如何从约会集返回所有的免费时间段 [英] How to return all the free periods of time from an appointment set

问题描述

使用以下屏幕截图显示数据集的示例，

Using the following screenshot to show an example of the data set,

int，datetime2，datetime2，int

int,datetime2,datetime2, int

如何返回在开始和停止范围内可用的所有可用时间段，这些时间段也等于或长于时间段​​持续时间参数，当它们不作为约会存储在数据库中时

declare @startRange datetime2
declare @endRange datetime2
declare @slotDurationInMinutes int

set @startRange = '2016-06-06T22:00:00.000Z'
set @endRange = '2016-06-07T21:59:00.000Z'
set @slotDurationInMinutes = 30


-- from this appointment dataset how do i query for all the free periods which are as long or longer than the slotduration parameter
-- these values are not stored in the table?
select TSO_Table_ID, time_start, time_end, duration from Org_TSO_Table

例如，slotduration参数为30分钟的查询的预期输出将是：

For example the expected output of a query where the slotduration param is 30 minutes would be:

free_from = 2016-06-06T22：00：00.000Z
free_until = 2016-06-06T22：00：30.000Z

free_from=2016-06-06T22:00:00.000Z free_until=2016-06-06T22:00:30.000Z

（此记录包含搜索范围的起始值）

(This record contains the search range start value)

free_from = -06T22：01：30.000Z
free_until = 2016-06-06T22：04：00.000Z

free_from=2016-06-06T22:01:30.000Z free_until=2016-06-06T22:04:00.000Z

free_from = 2016-06-06T22：04：20.000Z
free_until = 2016-06-06T22：10：00.000Z

free_from=2016-06-06T22:04:20.000Z free_until=2016-06-06T22:10:00.000Z

free_from = 2016-06-06T22：11：00.000Z
free_until = 2016-06-06T22：11：30.000Z

free_from=2016-06-06T22:11:00.000Z free_until=2016-06-06T22:11:30.000Z

free_from = 2016-06-06T22：12：30.000Z
free_until = 2016-06-07T21：59：00.000 Z

free_from=2016-06-06T22:12:30.000Z free_until=2016-06-07T21:59:00.000Z

（此记录包含搜索范围结束值）

(This record contains the search range end value)

推荐答案

很难说如果下面的解决方案适合你，给定小数据样本，但希望它会让你开始。

It's hard to say if the solution below will work for you, given the small data sample, but hopefully it will get you started.

IF OBJECT_ID('tempdb..#sked') is not null
DROP TABLE #sked

IF OBJECT_ID('tempdb..#tmpResults') is not null
DROP TABLE #tmpResults

create table #sked(
    ID int,
    time_start datetime2,
    time_end datetime2,
    duration int)

insert into #sked (ID,time_start,time_end,duration) values
(4,'2016-06-06 00:30:00','2016-06-06 01:30:00',3600000),
(2,'2016-06-06 04:00:00','2016-06-06 04:20:00',1200000),
(1,'2016-06-06 10:00:00','2016-06-06 11:00:00',3600000),
(6,'2016-06-06 11:30:00','2016-06-06 12:30:00',3600000)

declare @startRange datetime2
declare @endRange datetime2
declare @slotDurationInMinutes int

set @startRange = '2016-06-05T00:00:00.000'
set @endRange = '2016-06-07T21:59:00.000'
set @slotDurationInMinutes = 30

select
    time_end as free_from,
    isnull(lead(time_start) over (order by time_end),@endRange) as free_until
into #tmpResults
from
    #sked
where
    time_end >= @startRange 
    and time_end <= @endRange
    --and duration <= (@slotDurationInMinutes * 60000) --conversion to milliseconds

union all

select
    case when @startRange < min(time_start) then @startRange end as free_from,
    case when @startRange < min(time_start) then min(time_start) end as free_until
from
    #sked
where
    time_end >= @startRange 
    and time_end <= @endRange
    --and duration <= (@slotDurationInMinutes * 60000) --conversion to milliseconds
order by
    free_from

select 
    *,
    DATEDIFF(minute,free_from,free_until) 
from 
    #tmpResults
where
    free_from is not null
    and DATEDIFF(minute,free_from,free_until) >= @slotDurationInMinutes

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