在SQL中按中断序列升序/降序对结果最小值/最大值进行分组

如果序列打破了数据顺序，我想在升序/降序序列中选择最小值和最大值

假设我有按日期时间排序的数据：

LogDate      StartValue EndValue    Multiplier  DiffValue
2016-02-08   7661.25    7677.62     6.94        16.37
2016-02-09   7677.62    7693.02     6.94        15.4
2016-02-10   7693.02    7709.82     6.94        16.8
2016-02-11   7709.82    7727.08     6.94        17.26
2016-02-12   7727.08    7740.93     6.94        13.85
2016-02-13   3.02       12.22       6.94        9.2
2016-02-14   12.22      20.73       6.94        8.51
2016-02-15   20.73      37.04       6.94        16.31
2016-02-16   37.04      52.56       7           15.52
2016-02-17   52.56      67.82       7           15.26
2016-02-18   67.82      83.66       7           15.84
2016-02-19   83.66      98.77       7           15.11
2016-02-20   98.77      108.37      7           9.61

我想要的结果是：

LogDateMin  LogDateMax  StartValue  EndValue    Multiplier  SumOfDiffValue
2016-02-08  2016-02-12  7661.25     7740.93     6.94        79.68
2016-02-13  2016-02-15  3.02        37.04       6.94        34.02
2016-02-16  2016-02-20  37.04       108.37      7           71.34

在这里，我也通过乘法器对结果进行分组，并得到deffValue的和

我们如何才能做到这一点

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请帮助

如果我理解正确，break表示随着时间的推移，两个值之间的最小值阈值

为了获得结果，我使用了超前和滞后函数来查找中断，因为它们在当前记录之前和之后提供值，而不使用自联接

然后，我创建了只包含靠近断点的第一条和最后一条记录的组。结果集以行的形式包含日期和值，因此需要UNPIVOT

最终查询应如下所示：

declare @Threshold NUMERIC(18, 2) = 1000

;with DeltaCte as (
    SELECT DateTime, CurrValue, 
        LAG(CurrValue, 1, CurrValue - @Threshold - 1) OVER (ORDER BY DateTime) AS PrevVal, 
        LEAD(CurrValue, 1, CurrValue - @Threshold - 1) OVER (ORDER BY DateTime) AS NextVal
    FROM RawData
)
,GroupsCTE AS (
    select DateTime, CurrValue, CurrValue - PrevVal AS Delta1, CurrValue - NextVal AS Delta2, 
        (ROW_NUMBER() OVER (ORDER BY DateTime) + 1) / 2 AS GroupNo
    FROM DeltaCte
    WHERE ABS(CurrValue - PrevVal) > @Threshold OR ABS(CurrValue - NextVal) > @Threshold
)
SELECT GroupNo, MIN(d) AS DateTimeMin, MAX(d) DateTimeMax, 
    MIN(v) AS CurrValueMin, MAX(v) CurrValueMax
from GroupsCTE
UNPIVOT (v FOR nValue IN ([CurrValue])) AS P1
UNPIVOT (d FOR nDate IN ([DateTime])) AS P2
GROUP BY GroupNo

[编辑]

如果break表示升序中断，则上述查询会稍微简单一些：

;with DeltaCte as (
    SELECT DateTime, CurrValue, 
        LAG(CurrValue, 1, CurrValue + 1) OVER (ORDER BY DateTime) AS PrevVal, 
        LEAD(CurrValue, 1, CurrValue - 1) OVER (ORDER BY DateTime) AS NextVal
    FROM RawData
)
,GroupsCTE AS (
    select DateTime, CurrValue, CurrValue - PrevVal AS Delta1, CurrValue - NextVal AS Delta2, (ROW_NUMBER() OVER (ORDER BY DateTime) + 1) / 2 AS GroupNo
    FROM DeltaCte
    WHERE (CurrValue - PrevVal < 0) OR (NextVal - CurrValue <  0)
)
SELECT GroupNo, MIN(d) AS DateTimeMin, MAX(d) DateTimeMax, 
    MIN(v) AS CurrValueMin, MAX(v) CurrValueMax
from GroupsCTE
UNPIVOT (v FOR nValue IN ([CurrValue])) AS P1
UNPIVOT (d FOR nDate IN ([DateTime])) AS P2
GROUP BY GroupNo

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基本上，增量到阈值的比较被增量到0的比较所取代。

在上述示例中，如果系列中断数据顺序，您的意思是什么参见秒表示例，其数据以升序流动，但如果用户重置手表，则它将从零或最小值重新启动CurrValue感谢@alexei