從ms sql中的第一個數據中減去最後一個數據，但是每天都這樣做

Question

我有一個MS sql查詢，其中我計算了我的車的總公里數。爲了實現這一點，我創建了一個查詢，獲取最後的數據並從第一個數據中減去它。我可以每天實現這一目標，但現在我需要的是每天都有，但在日期範圍之內。這是我的代碼1日期過濾器。

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' 

現在這裏是我的代碼日期範圍和結果以及。結果顯示相同的，但由於即時得到總公里運行的每一天不是針對整個日期範圍

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 

這裏的結果日期範圍

一定是不一樣的這裏是預期的結果

與我的查詢日期範圍內的問題是計算整個日期範圍，從1開始獲取第一個數據，從6開始獲取最後一個數據。

請幫助我爲日期範圍重新配置我的sql查詢。

由於

數據爲March1

數據爲MAR2

數據爲Mar3

數據爲3月4日

數據爲3月5日

數據爲3月6日

結果可能會發生變化SI我只限於5個數據。

Answer 1

試試這個：

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)