从ms sql中的第一个数据中减去最后一个数据，但是每天都这样做

Question

我有一个MS sql查询，其中我计算了我的车的总公里数。为了实现这一点，我创建了一个查询，获取最后的数据并从第一个数据中减去它。我可以每天实现这一目标，但现在我需要的是每天都有，但在日期范围之内。这是我的代码1日期过滤器。

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' 

现在这里是我的代码日期范围和结果以及。结果显示相同的，但由于即时得到总公里运行的每一天不是针对整个日期范围

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 

这里的结果日期范围

一定是不一样的这里是预期的结果

与我的查询日期范围内的问题是计算整个日期范围，从1开始获取第一个数据，从6开始获取最后一个数据。

请帮助我为日期范围重新配置我的sql查询。

由于

数据为March1

数据为MAR2

数据为Mar3

数据为3月4日

数据为3月5日

数据为3月6日

结果可能会发生变化SI我只限于5个数据。

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)