从ms sql中的第一个数据中减去最后一个数据，但每天都这样做

Question

我有一个MS sql查询，我在其中计算了我的汽车总公里数。为此，我创建了一个查询，它获取最后一个数据并从第一个数据中减去它。我可以每天实现这一目标，但我现在需要的是每天都有，但是在日期范围内。这是我的1个日期过滤器的代码。

SELECT TOP 1 
(
    (
        (SELECT TOP 1 cast(kmrun as decimal(7,2)) as totkm 
            from [MARK_PASSIVE].[dbo].tblkmrun2 
                where PHILTIME BETWEEN '2015-03-02 00:00:00' AND '2015-03-02 23:59:00' 
                    AND PLATENO = 'UUM572' ORDER BY PHILTIME DESC) 
                    - 
        (SELECT TOP 1 cast(kmrun as decimal(7,2)) as totkm 
            from [MARK_PASSIVE].[dbo].tblkmrun2 
                where PHILTIME BETWEEN '2015-03-02 00:00:00' AND '2015-03-02 23:59:00' 
                    AND PLATENO = 'UUM572' ORDER BY PHILTIME ASC)
    )
) as finkm , 
(CONVERT(char(10), PHILTIME, 126)) as NEWDATE 
from [MARK_PASSIVE].[dbo].tblkmrun2 
where PHILTIME BETWEEN '2015-03-02 00:00:00' AND '2015-03-02 23:59:00'

现在我的代码是日期范围和结果。结果显示相同，但​​它必须不一样，因为我每天运行的总公里数不是整个日期范围

SELECT DISTINCT (CONVERT(char(10), PHILTIME, 126)), 
( 
    (
        (
            SELECT TOP 1 cast(kmrun as decimal(7,2)) as totkm 
                from [MARK_PASSIVE].[dbo].tblkmrun2 
                    where PHILTIME BETWEEN '2015-03-01 00:00:00' AND '2015-03-06 23:59:00' 
                        AND PLATENO = 'UUM572' group by kmrun ORDER BY PHILTIME DESC
        ) - 
        (
            SELECT TOP 1 cast(kmrun as decimal(7,2)) as totkm 
                from [MARK_PASSIVE].[dbo].tblkmrun2 
                    where PHILTIME BETWEEN '2015-03-01 00:00:00' AND '2015-03-06 23:59:00' 
                        AND PLATENO = 'UUM572' ORDER BY PHILTIME ASC
        )
    )
) as finkm , 
(CONVERT(char(10), PHILTIME, 126)) as NEWDATE 
    from [MARK_PASSIVE].[dbo].tblkmrun2 
        where PHILTIME BETWEEN '2015-03-01 00:00:00' AND '2015-03-06 23:59:00'
            ORDER BY NEWDATE DESC

这是日期范围的结果

这是预期的结果

我对日期范围的查询问题是它正在计算整个日期范围，从1获取第一个数据，从6获取最后一个数据。

请帮我重新配置日期范围的SQL查询。

由于

March1的数据

Mar2数据

Mar3的数据

3月4日的数据

3月5日的数据

3月6日的数据

结果可能会有所不同，因为我仅将数据限制为5。

Answer 1

试试这个：

DECLARE @startDate  DATE = '20150301'
DECLARE @endDate    DATE = '20150306'

;WITH Cte AS(
    SELECT *,
        FirstPhilTime = ROW_NUMBER() OVER(PARTITION BY CAST(PhilTime AS DATE) ORDER BY PhilTime ASC),
        LastPhilTime = ROW_NUMBER() OVER(PARTITION BY CAST(PhilTime AS DATE) ORDER BY PhilTime DESC)
    FROM tblkmrun2
)
SELECT
    CAST(PhilTime AS DATE),
    FinKm = MAX(CASE WHEN LastPhilTime = 1 THEN KmRun END) - MAX(CASE WHEN FirstPhilTime = 1 THEN KmRun END)
FROM cte
WHERE
    PhilTime >= @STARTDATE
    AND PhilTime < DATEADD(DAY, 1, @ENDDATE)
GROUP BY CAST(PhilTime AS DATE)