我正在预订电影院。我必须制定一个对电影有效的时间表。这意味着2部电影之间的时间(空间)应为0。
我需要做的是:我必须制作一个能够在2部电影之间找到30分钟的最大空间并将其设置为0的功能,以便电影具有完美的重叠。
例如:
电影1:11:00-13:00
电影2:13:30-15:00
电影3:15:30-16:00
结果应为:
电影1:11:00-13:00
电影2:13:00-15:00
电影3:15:00-16:00
这是我的表格: ShowTable
答案 0 :(得分:1)
IF OBJECT_ID('tempdb..#t') IS NOT NULL DROP TABLE #t
CREATE TABLE #t(Movie varchar(10),Starttime TIME,EndTime time)
INSERT INTO #t(Movie,Starttime,EndTime)
SELECT 'Movie 1','11:00','13:00' UNION ALL
SELECT 'Movie 2','13:30','15:00' UNION ALL
SELECT 'Movie 3','15:30','16:00'
UPDATE t SET t.Starttime=p.EndTime
FROM #t AS t
CROSS APPLY(SELECT MAX(tt.EndTime) AS EndTime FROM #t AS tt WHERE DATEDIFF(MINUTE,tt.EndTime,t.Starttime)>0) p
WHERE p.EndTime IS NOT NULL
SELECT * FROM #t
Movie Starttime EndTime ---------- ---------------- ---------------- Movie 1 11:00:00.0000000 13:00:00.0000000 Movie 2 13:00:00.0000000 15:00:00.0000000 Movie 3 15:00:00.0000000 16:00:00.0000000
您使用的是哪个版本,如果您使用的是2012+ 你也可以使用LAG
SELECT *,LAG(EndTime)OVER(ORDER BY EndTime) AS NewStartTime FROM #t
Movie Starttime EndTime NewStartTime ---------- ---------------- ---------------- ---------------- Movie 1 11:00:00.0000000 13:00:00.0000000 NULL Movie 2 13:30:00.0000000 15:00:00.0000000 13:00:00.0000000 Movie 3 15:30:00.0000000 16:00:00.0000000 15:00:00.0000000
我将roomid添加到样本数据中
IF OBJECT_ID('tempdb..#t') IS NOT NULL DROP TABLE #t
CREATE TABLE #t(ShowID int,RoomID int, Movie varchar(10),Starttime TIME,EndTime time)
INSERT INTO #t(ShowID,RoomId,Movie,Starttime,EndTime)
SELECT 1,1,'Movie 1','11:00','13:00' UNION ALL
SELECT 3,1,'Movie 2','13:30','15:00' UNION ALL
SELECT 4,1,'Movie 3','15:30','16:00' UNION ALL
SELECT 2,2,'Movie 3','12:30','14:30' UNION ALL
SELECT 5,2,'Movie 1','15:30','16:30'
SELECT *,LAG(EndTime)OVER(partition by RoomId ORDER BY EndTime) AS NewStartTime FROM #t
UPDATE t SET t.Starttime=isnull(p.NewStartTime,t.Starttime)
FROM #t AS t
inner join(
SELECT *,LAG(EndTime)OVER(partition by RoomId ORDER BY EndTime) AS NewStartTime FROM #t
) as p on t.ShowId=p.ShowId
select * FROM #t AS t
您想要以下结果吗?
ShowID RoomID Movie Starttime EndTime 1 1 1 Movie 1 11:00:00 13:00:00 2 3 1 Movie 2 13:00:00 15:00:00 3 4 1 Movie 3 15:00:00 16:00:00 4 2 2 Movie 3 12:30:00 14:30:00 5 5 2 Movie 1 14:30:00 16:30:00