为SQL Server 2012获取两次差异

Question

的背景:

我试图确定客户在特定房间花费的时间长度.每个客户都可以通过a识别CustomerID,当他们访问时,他们被分配了一个VisitNumber.例如,如果客户今天访问他们会得到一个VisitNumber说111111.然后他们将离开并在下周回来,并将有一个VisitNumber111112.

当客户第一次访问时,他们最初没有被分配房间,并且当他们最终被分配到他们的指定房间时,将条目写入数据库.CurrentRoom因为他们还没有房间,所以会是空白的,这NewRoom是他们搬进去的房间.

此条目将记录为事件1(客户从无房间移动到房间),时间是交易发生的时间.如果客户将来在其现有停留期间被移动,将被记录为事件9(客户从一个房间移动到另一个房间),并且还将记录CurrentRoom&*NewRoom值.

问题

我已经设法从上一行和下一行的时间使用LAG和LEAD获得时间,然后计算两次之间的差异,这给了我客户在该特定房间花费的时间长度.

使用LAG时的问题是它获取的是先前的值,在某些情况下可能是来自完全不同的客户的值.我想获取特定和当前的LAG和LEAD值,然后计算出值之间的差异,以找出该客户在一个房间中花了多长时间.CustomerIDVisitNumber

演示数据:

CREATE TABLE #beds
(
    [id] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,
     [User] [nvarchar](50) NULL,
    [CustomerID] [nvarchar](50) NULL,
     [Area] [nchar](10) NULL,
    [Event] [nvarchar](50) NULL,
    [VisitNumber] [nvarchar](50) NULL,
    [Time] [datetime] NULL,
     [CurrentRoom] [nvarchar](50) NULL,
     [NewRoom] [nvarchar](50) NULL
)
GO

INSERT INTO #beds ([User],[CustomerID],[Area],[Event],[VisitNumber],[Time],[CurrentRoom],[NewRoom])
VALUES ('00001','C11111111','Area1',2,111111111,'2017-03-22 11:05:44.360','B22','B44'),
('00001','C11111111','Area1',1,111111111,'2017-03-22 11:05:15.517','','B22'),
('00001','C22222222','Area2',1,222222222,'2017-03-22 07:38:16.117','','POD3'),
('00001','C22222222','Area2',3,222222222,'2017-03-22 07:41:24.787','POD3','POD3'),
('00001','C22222222','Area2',9,222222222,'2017-03-22 09:10:49.697','POD3',''),
('00001','C22222222','Area2',1,222222222,'2017-03-22 10:05:19.130','','POD15'),
('00001','C22222222','Area2',2,222222222,'2017-03-22 10:13:43.057','POD15','A'),
('00001','C22222222','Area2',3,222222222,'2017-03-22 10:25:01.527','A','A'),
('00001','C22222222','Area2',3,222222222,'2017-03-22 10:46:03.960','A','A'),
('00001','C22222222','Area2',3,222222222,'2017-03-22 10:46:17.030','A','A'),
('00002','C33333333','Area3',1,333333333,'2017-03-22 09:20:23.660','','B46'),
('00001','C33333333','Area2',9,333333333,'2017-03-22 08:53:32.860','POD8','POD1'),
('00001','C33333333','Area2',1,333333333,'2017-03-22 07:34:58.810','POD7','POD8'),
('00001','C33333333','Area2',1,333333333,'2017-03-22 11:49:55.203','','BB4'),
('00001','C33333333','Area2',3,333333333,'2017-03-22 11:50:11.943','BB4','BB4'),
('00001','C33333333','Area2',3,333333333,'2017-03-22 08:42:56.157','POD8','POD8'),
('00001','C33333333','Area2',3,333333333,'2017-03-22 08:22:59.157','POD8','POD8'),
('00003','C33333333','Area3',1,333333333,'2017-03-23 06:41:12.753','','B46')

GO

这是我到目前为止的查询; 这将给我前一行值和下一行值,但我认为不考虑客户.

SELECT
    T1.[User], T1.[CustomerID],
    T1.[Area], T1.[Event],
    T1.[VisitNumber],
    T1.[CurrentRoom], T1.[NewRoom],
    T1.[Time],
    LAG(T1.TIME) OVER (ORDER BY T1.VisitNumber) PreviousTime,
    LEAD(T1.TIME) OVER (ORDER BY T1.VisitNumber) NextTime
FROM
    #beds t1
WHERE
    T1.[Area] = 'Area2'
    AND T1.[CurrentRoom] IS NOT NULL
    AND T1.[NewRoom] IS NOT NULL
    AND T1.[CustomerID] IS NOT NULL
    AND T1.[CustomerID] <> ' '
    AND T1.Event IN (1,9)
ORDER BY
    VisitNumber DESC

预期输出:这是我期待的输出.我只想要TimeInRoom(不包括当时的日期字段):

+------------+-------+-------------+-------------+---------+------------+
| CustomerID | Area  | VisitNumber | CurrentRoom | NewRoom | TimeInRoom |
+------------+-------+-------------+-------------+---------+------------+
|C33333333   |Area2  | 333333333   |             | BB4     | 00:10      |
|C33333333   |Area2  | 333333333   |             | POD8    | 00:20      |
|C33333333   |Area2  | 333333333   | POD8        |         | 00:30      |
+------------+-------+-------------+-------------+---------+------------+

Answer 1

我希望这有帮助：

;WITH cte_Result AS
(
    SELECT
        [CustomerID],
        [Area],
        [VisitNumber],
        [CurrentRoom],
        [NewRoom],
        [Time],
        LAG([TIME]) OVER (partition by [CustomerID],[VisitNumber] ORDER BY ID DESC) PreviousTime,
        LEAD([TIME]) OVER (partition by [CustomerID],[VisitNumber] ORDER BY ID DESC) NextTime
    FROM #beds
    WHERE   [Area] = 'Area2'
        AND [CurrentRoom] IS NOT NULL
        AND [NewRoom] IS NOT NULL
        AND [CustomerID] IS NOT NULL
        AND [CustomerID] <> ' '
        AND [Event] IN (1,9)
        --AND [CustomerID] = 'C33333333'
),
cte_BuildStayPeriod
AS (
    SELECT CustomerID,
        Area,
        VisitNumber,
        CurrentRoom,
        NewRoom,
        DATEDIFF(SECOND, COALESCE([NextTime], PreviousTime), COALESCE(PreviousTime, [time])) AS StayDuration
    FROM cte_Result
)
SELECT CustomerID,
    Area,
    VisitNumber,
    CurrentRoom,
    NewRoom,
    StayDuration,
    CAST(DATEADD(SECOND, StayDuration, '1900-01-01') AS TIME) AS StayDuration
FROM cte_BuildStayPeriod