我们有一个生产数据库，可以提前多年管理100个分支机构的人员，并且具有精确的分级。
此系统的一部分是突出差距的报告，即比较分行开放时间和员工预订，以查看是否有任何分支机构在没有预订的情况下开放。
它还可以同时检查重叠，双重预订等，基本上需要精确的水平精度。
我们这样做的方法是使用整数计数表将开放时间和预订的开始和结束时间扩展为几分钟：
--===== Create and populate the Tally table on the fly
SELECT TOP 16777216
IDENTITY(INT,1,1) AS N
INTO dbo.Tally
FROM Master.dbo.SysColumns sc1,
Master.dbo.SysColumns sc2,
Master.dbo.SysColumns sc3
--===== Add a Primary Key to maximize performance
ALTER TABLE dbo.Tally
ADD CONSTRAINT PK_Tally_N
PRIMARY KEY CLUSTERED (N) WITH FILLFACTOR = 100
我们利用这个静态索引计数表来扩展开放时间和预订，如下所示：
SELECT [BranchID] ,
[DayOfWeek] ,
DATEADD(MINUTE, N - 1, StartTime)
FROM OpeningHours
LEFT OUTER JOIN tally ON tally.N BETWEEN 0
AND DATEDIFF(MINUTE, OpeningHours.StartTime, OpeningHours.EndTime) + 1
问题是，一旦我们有13,000,000“开放时间”和“预订时间”，我们就需要加入结果，看看有什么内容：
SELECT OpenDatesAndMinutes.[Date] ,
OpenDatesAndMinutes.[Time] ,
OpenDatesAndMinutes.[BranchID] ,
ISNULL(BookedMinutes.BookingCount, 0) AS BookingCount
FROM OpenDatesAndMinutes
LEFT OUTER JOIN BookedMinutes ON OpenDatesAndMinutes.BranchID = BookedMinutes.BranchID
AND OpenDatesAndMinutes.[Date] = BookedMinutes.[Date]
AND OpenDatesAndMinutes.[Time] = BookedMinutes.[Time]
你可以想象，加入分行，约会和日期所有存储在CTE表中的13,000,000行的时间需要AGES - 运行一周不太糟糕，大约10秒但如果我们运行它6个月（13,000,000分钟）膨胀到25分钟+
一旦我们将开放的会议记录加入到预订的会议记录中，我们就会将岛上的数据分组并呈现给用户：
CrossTabPrep ( [Date], [Time], [BranchID], [BookingCount], [Grp] )
AS ( SELECT [Date] ,
[Time] ,
[BranchID] ,
[BookingCount] ,
DATEPART(HOUR, Time) * 60 + DATEPART(MINUTE, Time) - ROW_NUMBER() OVER ( PARTITION BY [BranchID], Date, [BookingCount] ORDER BY Time ) AS [Grp]
FROM PreRender
),
FinalRender ( [BranchID], [Date], [Start Time], [End Time], [Duration], [EntryCount], [EntryColour] )
AS ( SELECT [BranchID] ,
[Date] ,
MIN([Time]) AS [Start Time] ,
MAX([Time]) AS [End Time] ,
ISNULL(DATEDIFF(MINUTE, MIN([Time]), MAX([Time])), 0) AS Duration ,
[BookingCount] AS EntryCount ,
CASE WHEN [BookingCount] = 0 THEN 'Red'
WHEN [BookingCount] = 1 THEN 'Green'
ELSE 'Yellow'
END AS EntryColour
FROM CrossTabPrep
GROUP BY [BranchID] ,
[Date] ,
[BookingCount] ,
[Grp]
)
很简单，我的方法有效吗？有什么方法可以改进这种方法，同时保持分钟水平的准确性？当处理诸如此类的大量CTE表时，将这些数据转储到索引临时表和放大器中会有什么好处。加入他们呢？
我正在考虑的另一件事是取代DATE＆amp;大联接使用的TIME（0）数据类型，如果我将它们转换为整数会更有效吗？
以下是完整的CTE，如果有帮助：
WITH OpeningHours ( [BranchID], [DayOfWeek], [StartTime], [EndTime] )
AS ( SELECT BranchID ,
DayOfWeek ,
CONVERT(TIME(0), AM_open) ,
CONVERT(TIME(0), AM_close)
FROM db_BranchDetails.dbo.tbl_ShopOpeningTimes (NOLOCK)
INNER JOIN @tbl_Days Filter_Days ON db_BranchDetails.dbo.tbl_ShopOpeningTimes.DayOfWeek = Filter_Days.DayNumber
WHERE CONVERT(TIME(0), AM_open) <> CONVERT(TIME(0), '00:00:00')
UNION ALL
SELECT BranchID ,
DayOfWeek ,
CONVERT(TIME(0), PM_open) ,
CONVERT(TIME(0), PM_close)
FROM db_BranchDetails.dbo.tbl_ShopOpeningTimes (NOLOCK)
INNER JOIN @tbl_Days Filter_Days ON db_BranchDetails.dbo.tbl_ShopOpeningTimes.DayOfWeek = Filter_Days.DayNumber
WHERE CONVERT(TIME(0), PM_open) <> CONVERT(TIME(0), '00:00:00')
UNION ALL
SELECT BranchID ,
DayOfWeek ,
CONVERT(TIME(0), EVE_open) ,
CONVERT(TIME(0), EVE_close)
FROM db_BranchDetails.dbo.tbl_ShopOpeningTimes (NOLOCK)
INNER JOIN @tbl_Days Filter_Days ON db_BranchDetails.dbo.tbl_ShopOpeningTimes.DayOfWeek = Filter_Days.DayNumber
WHERE CONVERT(TIME(0), EVE_open) <> CONVERT(TIME(0), '00:00:00')
),
DateRange ( [Date], [DayOfWeek] )
AS ( SELECT CONVERT(DATE, DATEADD(DAY, N - 1, @StartDate)) ,
DATEPART(WEEKDAY, DATEADD(DAY, N - 1, @StartDate))
FROM tally (NOLOCK)
WHERE N <= DATEDIFF(DAY, @StartDate, @EndDate) + 1
),
OpenMinutes ( [BranchID], [DayOfWeek], [Time] )
AS ( SELECT [BranchID] ,
[DayOfWeek] ,
DATEADD(MINUTE, N - 1, StartTime)
FROM OpeningHours
LEFT OUTER JOIN tally ON tally.N BETWEEN 0
AND DATEDIFF(MINUTE, OpeningHours.StartTime, OpeningHours.EndTime) + 1
),
OpenDatesAndMinutes ( [Date], [Time], [BranchID] )
AS ( SELECT DateRange.[Date] ,
OpenMinutes.[Time] ,
OpenMinutes.BranchID
FROM DateRange
LEFT OUTER JOIN OpenMinutes ON DateRange.DayOfWeek = OpenMinutes.DayOfWeek
WHERE OpenMinutes.BranchID IS NOT NULL
),
WhiteListEmployees ( [DET_NUMBERA] )
AS ( SELECT DET_NUMBERA
FROM [dbo].[tbl_ChrisCache_WhiteList]
WHERE [TimeSheetV2_SecurityContext] = @TimeSheetV2_SecurityContext
),
BookedMinutesByRole ( [Date], [Time], [BranchID], BookingCount )
AS ( SELECT [BookingDate] ,
DATEADD(MINUTE, N - 1, StartTime) ,
BranchID ,
COUNT(BookingID) AS Bookings
FROM tbl_Booking (NOLOCK)
INNER JOIN tbl_BookingReason (NOLOCK) ON dbo.tbl_BookingReason.ReasonID = dbo.tbl_Booking.ReasonID
INNER JOIN tbl_ChrisCache (NOLOCK) ON dbo.tbl_Booking.DET_NUMBERA = dbo.tbl_ChrisCache.DET_NUMBERA
INNER JOIN @ValidPosCodes AS Filter_PostCodes ON dbo.tbl_ChrisCache.POS_NUMBERA = Filter_PostCodes.POSCODE
LEFT OUTER JOIN tally (NOLOCK) ON tally.N BETWEEN 0
AND DATEDIFF(MINUTE, tbl_Booking.StartTime, tbl_Booking.EndTime) + 1
WHERE ( Void = 0 )
AND tbl_BookingReason.CoverRequired = 0 --#### Only use bookings that dont require cover
AND tbl_booking.BranchID <> '023' --#### Branch 23 will always have messy data
AND ( dbo.tbl_Booking.BookingDate BETWEEN @StartDate
AND @EndDate )
GROUP BY [BookingDate] ,
BranchID ,
DATEADD(MINUTE, N - 1, StartTime)
),
BookedMinutesByWhiteList ( [Date], [Time], [BranchID], BookingCount )
AS ( SELECT [BookingDate] ,
DATEADD(MINUTE, N - 1, StartTime) ,
BranchID ,
COUNT(BookingID) AS Bookings
FROM tbl_Booking(NOLOCK)
INNER JOIN tbl_BookingReason (NOLOCK) ON dbo.tbl_BookingReason.ReasonID = dbo.tbl_Booking.ReasonID
INNER JOIN tbl_ChrisCache (NOLOCK) ON dbo.tbl_Booking.DET_NUMBERA = dbo.tbl_ChrisCache.DET_NUMBERA
INNER JOIN WhiteListEmployees Filter_WhiteList ON dbo.tbl_Booking.DET_NUMBERA = Filter_WhiteList.DET_NUMBERA
LEFT OUTER JOIN tally (NOLOCK) ON tally.N BETWEEN 0
AND DATEDIFF(MINUTE, tbl_Booking.StartTime, tbl_Booking.EndTime) + 1
WHERE ( Void = 0 )
AND tbl_BookingReason.CoverRequired = 0 --#### Only use bookings that dont require cover
AND tbl_booking.BranchID <> '023' --#### Branch 23 will always have messy data
AND ( dbo.tbl_Booking.BookingDate BETWEEN @StartDate
AND @EndDate )
GROUP BY [BookingDate] ,
BranchID ,
DATEADD(MINUTE, N - 1, StartTime)
),
BookedMinutes ( [Date], [Time], [BranchID], BookingCount )
AS ( SELECT [Date] ,
[Time] ,
[BranchID] ,
BookingCount
FROM BookedMinutesByRole
UNION
SELECT [Date] ,
[Time] ,
[BranchID] ,
BookingCount
FROM BookedMinutesByWhiteList
),
PreRender ( [Date], [Time], [BranchID], [BookingCount] )
AS ( SELECT OpenDatesAndMinutes.[Date] ,
OpenDatesAndMinutes.[Time] ,
OpenDatesAndMinutes.[BranchID] ,
ISNULL(BookedMinutes.BookingCount, 0) AS BookingCount
FROM OpenDatesAndMinutes
LEFT OUTER JOIN BookedMinutes ON OpenDatesAndMinutes.BranchID = BookedMinutes.BranchID
AND OpenDatesAndMinutes.[Date] = BookedMinutes.[Date]
AND OpenDatesAndMinutes.[Time] = BookedMinutes.[Time]
),
CrossTabPrep ( [Date], [Time], [BranchID], [BookingCount], [Grp] )
AS ( SELECT [Date] ,
[Time] ,
[BranchID] ,
[BookingCount] ,
DATEPART(HOUR, Time) * 60 + DATEPART(MINUTE, Time) - ROW_NUMBER() OVER ( PARTITION BY [BranchID], Date, [BookingCount] ORDER BY Time ) AS [Grp]
FROM PreRender
),
DeletedBranches ( [BranchID] )
AS ( SELECT [ShopNo]
FROM [dbo].[vw_BranchList]
WHERE [Branch_Deleted] = 1
),
FinalRender ( [BranchID], [Date], [Start Time], [End Time], [Duration], [EntryCount], [EntryColour] )
AS ( SELECT [BranchID] ,
[Date] ,
MIN([Time]) AS [Start Time] ,
MAX([Time]) AS [End Time] ,
ISNULL(DATEDIFF(MINUTE, MIN([Time]), MAX([Time])), 0) AS Duration ,
--dbo.format_timeV2(ISNULL(DATEDIFF(SECOND, MIN([Time]), MAX([Time])), 0)) AS DurationF ,
[BookingCount] AS EntryCount ,
CASE WHEN [BookingCount] = 0 THEN 'Red'
WHEN [BookingCount] = 1 THEN 'Green'
ELSE 'Yellow'
END AS EntryColour
FROM CrossTabPrep
GROUP BY [BranchID] ,
[Date] ,
[BookingCount] ,
[Grp]
)
SELECT [BranchID] ,
CONVERT(VARCHAR(10), DATEADD(DAY, 7, CONVERT(DATETIME, CONVERT(VARCHAR(10), DATEADD(day, -1 - ( DATEPART(dw, [Date]) + @@DATEFIRST - 2 ) % 7, [Date]), 103) + ' 23:59:59', 103)), 103) AS WeekEnding ,
[Date] ,
[Start Time] ,
[End Time] ,
[Duration] ,
CONVERT(VARCHAR, ( [Duration] * 60 ) / 3600) + 'h ' + CONVERT(VARCHAR, ROUND(( ( CONVERT(FLOAT, ( ( [Duration] * 60 ) % 3600 )) ) / 3600 ) * 60, 0)) + 'm' AS [DurationF] ,
[EntryCount] ,
[EntryColour] ,
CASE WHEN [EntryCount] = 0 THEN 'Red'
WHEN [EntryCount] >= 1 THEN 'Green'
END AS DurationColour ,
CASE WHEN [EntryCount] = 0 THEN 'This period of open-time isnt covered'
WHEN [EntryCount] >= 1 THEN 'This period of open-time is covered by ' + CONVERT(VARCHAR, [EntryCount]) + ' booking(s)'
END AS [DurationComment]
FROM FinalRender
WHERE FinalRender.BranchID NOT IN ( SELECT [BranchID]
FROM DeletedBranches )
答案 0 :(得分：1)
这很有趣，因为你最后回答了自己的问题。你应该尝试一下，但总结一下：
[DayOfWeek],DATEADD(MINUTE, N - 1, StartTime)跳到另一个[Date],[Time]上的联接，但是这里有两列没有意义。使用单个datetime或代表来自时代的seconds的bigint。 UnixTimestamp在这里工作得很好。