如何返回的時間全部免費時段從預約設定

Question

使用下面的截圖中顯示的數據集的一個例子，

INT，DATETIME2，DATETIME2，詮釋

我怎樣才能回報大家的時間段免費的所述開始內是可用的，並停止其也比當它們不存儲在數據庫中作爲預約時隙持續時間等於參數或更長範圍

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 

例如查詢，其中slotduration PARAM爲30分鐘將是預期的輸出：

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

（此記錄包含在搜索範圍開始值）

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

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

（此記錄包含在搜索範圍結束值）

Answer 1

很難說出下面的解決方案是否適合你，因爲有小數據樣本，但希望它能幫助你開始。

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