unter Beispieldaten:
select * into #t from (
select 1 ID, '2016-04-06 09:00:00' r_start , '2016-04-06 09:15:00' r_end union
select 2, '2016-04-06 11:00:00', '2016-04-06 11:30:00'union
select 3, '2016-04-06 12:00:00', '2016-04-06 12:45:00'union
select 4, '2016-04-06 16:30:00', '2016-04-06 16:45:00') AS bookdata
folgende Abfrage ergibt alle freien Zeitschlitze:
;with booked as (
select r_start, r_end
, LAG(r_end) over (order by r_end) PrevBook
, LEAD(r_start) over (order by r_start) NextBook
from #t
)
select IsNull(PrevBook, '2016-04-06 07:00:00') AS FreeStart, r_start AS FreeEnd
from booked
union
select r_end, IsNull(NextBook, '2016-04-06 19:00:00')
from booked
Ergebnis
+---------------------+---------------------+
| FreeStart | FreeEnd |
+---------------------+---------------------+
| 2016-04-06 07:00:00 | 2016-04-06 09:00:00 |
| 2016-04-06 09:15:00 | 2016-04-06 11:00:00 |
| 2016-04-06 11:30:00 | 2016-04-06 12:00:00 |
| 2016-04-06 12:45:00 | 2016-04-06 16:30:00 |
| 2016-04-06 16:45:00 | 2016-04-06 19:00:00 |
+---------------------+---------------------+
Wenn Sie SQL älter als 2012 verwenden werden Sie nicht LEAD und LAG haben, so dass Sie unter Abfrage stattdessen verwenden können, Ihre ID als Primärschlüssel unter der Annahme
;with booked as (
select r_start, r_end
, (select top 1 r_end from #t where ID < tbl.ID order by ID desc) PrevBook
, (select top 1 r_start from #t where ID > tbl.ID order by ID) NextBook
from #t tbl
)
select IsNull(PrevBook, '2016-04-06 07:00:00') AS FreeStart, r_start AS FreeEnd
from booked
union
select r_end, IsNull(NextBook, '2016-04-06 19:00:00')
from booked
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