我正在使用SQL Server Management Studio 2008进行查询创建。 Reporting Services 2008用于创建报告。
我一直试图在几周内解决这个问题而且我已经打了一堵砖墙。我希望有人能够提出解决方案，因为现在我的大脑变得糊里糊涂。
我目前正在开发一个SQL查询，它将数据提供给Reporting Services报告。该报告的目的是显示我们所在县周围地区的急救员的可用率百分比。我们的想法是，在我们的20个地点中，每个地点应该只有一名急救人员提供保险。< / p>
除了一个地方的第一位助手在每个封面期间的开始和结束时重叠他们的封面外，这一切都很好。
封面重叠示例：
| Location | start_date | end_date | +----------+---------------------+---------------------+ | Wick | 22/06/2015 09:00:00 | 22/06/2015 19:00:00 | | Wick | 22/06/2015 18:30:00 | 23/06/2015 09:00:00 | | Wick | 23/06/2015 09:00:00 | 23/06/2015 18:30:00 | | Wick | 23/06/2015 18:00:00 | 24/06/2015 09:00:00 | +----------+---------------------+---------------------+
在一个完美的世界中，他们设置掩盖的数据库不允许他们这样做，但它是一个外部开发的数据库，不允许我们对其进行更改。我们也不允许创建函数，存储过程，计数表等......
查询本身应返回每个位置有急救保障的分钟数，然后分解为一天中的几小时。封面上的任何重叠不应该最终增加额外的封面，应该合并。一个人可以一次打开，如果他们重叠，那么它应该只算作一个人的掩护。
示例输出：
+----------+---------------------+---------------------+----------+--------------+--------+-------+------+----------+ | Location | fromDt | toDt | TimeDiff | Availability | DayN | DayNo | Hour | DayCount | +----------+---------------------+---------------------+----------+--------------+--------+-------+------+----------+ | WicK | 22/06/2015 18:00:00 | 22/06/2015 18:59:59 | 59 | 100 | Monday | 1 | 18 | 0 | | WicK | 22/06/2015 18:30:00 | 22/06/2015 18:59:59 | 29 | 50 | Monday | 1 | 18 | 0 | | WicK | 22/06/2015 19:00:00 | 22/06/2015 19:59:59 | 59 | 100 | Monday | 1 | 19 | 0 | +----------+---------------------+---------------------+----------+--------------+--------+-------+------+----------+
示例代码：
DECLARE
@StartTime datetime,
@EndTime datetime,
@GivenDate datetime;
SET @GivenDate = '2015-06-22';
SET @StartTime = @GivenDate + ' 00:00:00';
SET @EndTime = '2015-06-23' + ' 23:59:59';
Declare @Sample Table
(
Location Varchar(50),
StartDate Datetime,
EndDate Datetime
)
Insert @Sample
Select
sta.location,
act.Start,
act.END
from emp,
con,
sta,
act
where
emp.ID = con.ID
and con.location = sta.location
and SUBSTRING(sta.ident,3,2) in ('51','22')
and convert(varchar(10),act.start,111) between @GivenDate and @EndTime
and act.ACT= 18
group by sta.location,
act.Start,
act.END
order by 2
;WITH Yak (location, fromDt, toDt, maxDt,hourdiff)
AS (
SELECT location,
StartDate,
/*check if the period of cover rolls onto the next hour */
convert(datetime,convert(varchar(21),
CONVERT(varchar(10),StartDate,111)+' '
+convert(varchar(2),datepart(hour,StartDate))+':59'+':59'))
,
EndDate
,dateadd(hour,1,dateadd(hour, datediff(hour, 0, StartDate), 0))-StartDate
FROM @Sample
UNION ALL
SELECT location,
dateadd(second,1,toDt),
dateadd(hour, 1, toDt),
maxDt,
hourdiff
FROM Yak
WHERE toDt < maxDt
) ,
TAB1 (location, FROMDATE,TODATE1,TODATE) AS
(SELECT
location,
@StartTime,
convert(datetime,convert(varchar(21),
CONVERT(varchar(10),@StartTime,120)+' '
+convert(varchar(2),datepart(hour,@StartTime))+':59'+':59.999')),
@EndTime
from @Sample
UNION ALL
SELECT
location,
(DATEADD(hour, 1,(convert(datetime,convert(varchar(21),
CONVERT(varchar(10),FROMDATE,120)+' '
+convert(varchar(2),datepart(hour,FROMDATE))+':00'+':00.000')))))ToDate,
(DATEADD(hour, 1,(convert(datetime,convert(varchar(21),
CONVERT(varchar(10),TODATE1,120)+' '
+convert(varchar(2),datepart(hour,TODATE1))+':59'+':59.999'))))) Todate1,
TODATE
FROM TAB1 WHERE TODATE1 < TODATE
),
/*CTE Tab2 adds zero values to all possible hours between start and end dates */
TAB2 AS
(SELECT location, FROMDATE,
CASE WHEN TODATE1 > TODATE THEN TODATE ELSE TODATE1 END AS TODATE
FROM TAB1)
SELECT location,
fromDt,
/* Display MaxDT as start time if cover period goes into next dat */
CASE WHEN toDt > maxDt THEN maxDt ELSE toDt END AS toDt,
/* If the end date is on the next day find out the minutes between the start date and the end of the day or find out the minutes between the next day and the end date */
Case When ToDt > Maxdt then datediff(mi,fromDt,maxDt) else datediff(mi,FromDt,ToDt) end as TimeDiff,
Case When ToDt > Maxdt then round(datediff(S,fromDt,maxDt)/3600.0*100,0) else round(datediff(S,FromDt,ToDt)/3600.0*100.0,0) end as Availability,
/*Display the name of the day of the week*/
CASE WHEN toDt > maxDt THEN datename(dw,maxDt) ELSE datename(dw,fromDt) END AS DayN,
CASE WHEN toDt > maxDt THEN case when datepart(dw,maxDt)-1 = 0 then 7 else datepart(dw,maxDt)-1 end ELSE case when datepart(dw,fromDt)-1 = 0 then 7 else datepart(dw,fromDt)-1 END end AS DayNo
,DATEPART(hour, fromDt) as Hour,
'0' as DayCount
FROM Yak
where Case When ToDt > Maxdt then datediff(mi,fromDt,maxDt) else datediff(mi,FromDt,ToDt) end <> 0
group by location,fromDt,maxDt,toDt
Union all
SELECT
tab2.location,
convert(varchar(19),Tab2.FROMDATE,120),
convert(varchar(19),Tab2.TODATE,120),
'0',
'0',
datename(dw,FromDate) DayN,
case when datepart(dw,FromDate)-1 = 0 then 7 else datepart(dw,FromDate)-1 end AS DayNo,
DATEPART(hour, fromDate) as Hour,
COUNT(distinct datename(dw,fromDate))
FROM TAB2
Where datediff(MINUTE,convert(varchar(19),Tab2.FROMDATE,120),convert(varchar(19),Tab2.TODATE,120)) > 0
group by location, TODATE, FROMDATE
Order by 2
option (maxrecursion 0)
我尝试了以下论坛参赛作品，但他们没有在我的案例中工作： http://forums.teradata.com/forum/general/need-help-merging-consecutive-and-overlapping-date-spans
Checking for time range overlap, the watchman problem [SQL]
Calculate Actual Downtime ignoring overlap in dates/times
很抱歉这么长，但我想我会尽量给你尽可能详细的信息。任何帮助将非常感激。谢谢。
答案 0 :(得分：0)
所以我想出的解决方案使用临时表，您可以轻松地将它们更改为CTE，从而避免使用存储过程。
我尝试使用窗口函数来查找重叠的记录并获取最小和最大时间，问题是您有重叠链，例如09:00-09：10、09：05-09：15、09：11-09:20，所以涵盖了从09:00到09:20的所有分钟，但几乎无法分辨09:00-09 ：10与09:11-09:20有关，而不会重复浏览结果，直到您触及整个链的底部。 （希望这是有道理的。）
因此，我将所有日期范围分解为StartDate和EndDate之间的每一分钟，然后可以使用ROW_NUMBER（）窗口函数来捕获所有重复项，然后可以使用它查看有多少不同的人覆盖了同一分钟。
CREATE TABLE dbo.dates
(
Location VARCHAR(64),
StartDate DATETIME,
EndDate DATETIME
);
INSERT INTO dbo.dates VALUES
('Wick','20150622 09:00:00','20150622 19:00:00'),
('Wick','20150622 18:30:00','20150624 09:00:00'),
('Wick','20150623 09:00:00','20150623 18:30:00'),
('Wick','20150623 18:00:00','20150624 09:00:00'),
('Wick','20150630 09:00:00','20150630 09:30:00'),
('Wick','20150630 09:00:00','20150630 09:45:00'),
('Wick','20150630 09:10:00','20150630 09:25:00'),
('Wick','20150630 09:35:00','20150630 09:55:00'),
('Wick','20150630 09:57:00','20150630 10:10:00');
SELECT ROW_NUMBER() OVER (PARTITION BY Location ORDER BY StartDate) [Id],
Location,
StartDate,
EndDate
INTO dbo.overlaps
FROM dbo.dates;
SELECT TOP 10000 N=IDENTITY(INT, 1, 1)
INTO dbo.Num
FROM master.dbo.syscolumns a CROSS JOIN master.dbo.syscolumns b;
SELECT 0 [N] INTO dbo.Numbers;
INSERT INTO dbo.Numbers SELECT * FROM dbo.Num;
SELECT [Location] = raw.Location,
[WorkedDate] = CAST([MinuteWorked] AS DATE),
[DayN] = DATENAME(WEEKDAY, [MinuteWorked]),
[DayNo] = DATEPART(WEEKDAY, [MinuteWorked]) -1,
[Hour] = DATEPART(HOUR, [MinuteWorked]),
[MinutesWorked] = SUM(IIF(raw.[Minutes] = 1, 1, 0)),
[MaxWorkers] = MAX(raw.[Minutes])
FROM
(
SELECT
o.Location,
DATEADD(MINUTE, n.N, StartDate) [MinuteWorked],
ROW_NUMBER() OVER (PARTITION BY o.Location, DATEADD(MINUTE, n.N, StartDate) ORDER BY DATEADD(MINUTE, n.N, StartDate)) [Minutes]
FROM dbo.overlaps o
INNER JOIN dbo.Numbers n ON n.N < DATEDIFF(MINUTE, StartDate, EndDate)
) raw
GROUP BY
raw.Location,
CAST([MinuteWorked] AS DATE),
DATENAME(WEEKDAY, [MinuteWorked]),
DATEPART(WEEKDAY, [MinuteWorked]) - 1,
DATEPART(HOUR, [MinuteWorked])
这是结果的子集：
Location WorkedDate DayN DayNo Hour MinutesWorked MaxWorkers
Wick 2015-06-24 Wednesday 3 8 60 2
Wick 2015-06-30 Tuesday 2 9 58 3
Wick 2015-06-30 Tuesday 2 10 10 1
Here's小提琴