如图所示，您建议采用何种结构有效地查询范围内的最大值/最小值？

Question

FW：我可能已经结合了mysql语法和SQL语法。我在工作中使用SQL（也就是说，现在），然后使用mysql进行侧面项目，所以我可能没有在所有内容上使用正确的语法（查询应该是正确的）所以请耐心等待我大声笑

我有一个数据库，包含按天汇总的各个零件的价格（PartPrices）。我想运行一个查询，以查看哪些部分的价格增长最多，哪个部分的价格在日期范围内下降最多。此日期范围可以是从开始日期到现在，也可以是开始日期到任何时间段。

架构如下所示：

$list = Get-PnPList -Identity Documents
$web = $list.ParentWeb
$folder = Ensure-PnPFolder -Web $list.ParentWeb -SiteRelativePath "Shared Documents/MoveTo"
$tofolder = Ensure-PnPFolder -Web $list.ParentWeb -SiteRelativePath "Shared Documents/MoveTwo"

function MoveFolder
{
    [cmdletbinding()]
    Param (
        $web,
        $fromFolder,
        $toFolder
    )
    $fromFolder.Context.Load($fromFolder.Files)
    $fromFolder.Context.Load($fromFolder.Folders)
    $fromFolder.Context.ExecuteQuery()
    foreach ($file in $fromFolder.Files)
    {
        $targetFileUrl = $file.ServerRelativeUrl.Replace($fromFolder.ServerRelativeUrl, $toFolder.ServerRelativeUrl);
        $file.MoveTo($targetFileUrl, [Microsoft.SharePoint.Client.MoveOperations]::Overwrite);
    }
    $fromFolder.Context.ExecuteQuery();

    foreach ($subFolder in $fromFolder.Folders)
    {
        $targetFolderUrl = $subFolder.ServerRelativeUrl.Replace($fromFolder.ServerRelativeUrl, $toFolder.ServerRelativeUrl);
        $targetFolderRelativePath = $targetFolderUrl.SubString($web.RootFolder.ServerRelativeUrl.Length)
        $tofolder = Ensure-PnPFolder -Web $list.ParentWeb -SiteRelativePath $targetFolderRelativePath
        MoveFolder -Web $web -fromFolder $subFolder -toFolder $tofolder
    }
}

$web.Context.Load($web.RootFolder)
$web.Context.ExecuteQuery()
MoveFolder -Web $web -fromFolder $folder -toFolder $tofolder
$folder.DeleteObject()
$web.Context.ExecuteQuery()

基本上我拥有的内容如下：

PartID | DateTime (Time stamp from start of day) | Price

我觉得这个查询没有被优化，这就是为什么我要联系SO社区进行输入。如果您认为我应该以不同方式处理这些数据，我也愿意接受建议。提前致谢。以下是PartPrices的一些原始样本数据（请记住，这些数据是夸大的，以避免添加大量数据）：

DECLARE @StartDate AS DATETIMEOFFSET
DECLARE @EndDate AS DATETIMEOFFSET

WITH LastPartPrices AS (
   SELECT *
   FROM
      (SELECT
          PartID
          ,DateTime
          ,Price
       FROM PartPrices
       WHERE PartPrices.DateTime <= @EndDate
       GROUP BY `PartID`, DateTime DESC, Price) t
   GROUP BY `PartID`),
HighestPartPrices AS (
   SELECT *
   FROM
      (SELECT
          PartID
          ,DateTime
          ,Price
       FROM PartPrices
       WHERE PartPrices.DateTime BETWEEN @StartDate AND @EndDate
       GROUP BY `PartID`, Price DESC, DateTime) t
   GROUP BY `PartID`),
LowestPartPrices AS (
   SELECT *
   FROM
      (SELECT
          PartID
          ,DateTime
          ,Price
       FROM PartPrices
       WHERE PartPrices.DateTime BETWEEN @StartDate AND @EndDate
       GROUP BY `PartID`, Price ASC, DateTime) t
   GROUP BY `PartID`)

SELECT
   Parts.ID
   ,Parts.Name
   ,Parts.Description
   ,LastPartPrices.Price AS LastPrice
   ,( (LastPartPrices.Price - HighestPartPrices.Price) / HighestPartPrices.Price ) AS HighCurrentDifference
   ,( (LastPartPrices.Price - LowestPartPrices.Price) / LowestPartPrices.Price ) AS LowCurrentDifference
FROM Parts
INNER JOIN LastPartPrices ON Parts.ID = LastPartPrices.PartID
INNER JOIN HighestPartPrices ON Parts.ID = HighestPartPrices.PartID
INNER JOIN LowestPartPrices ON Parts.ID = LowestPartPrices.PartID

我期望获得以下内容：

{1, '2016-03-01T00:00:00+00:00', 150.40 },
{1, '2016-03-02T00:00:00+00:00', 170.50 },
{1, '2016-03-03T00:00:00+00:00', 160.00 },

{2, '2016-03-01T00:00:00+00:00', 80.30 },
{2, '2016-03-02T00:00:00+00:00', 100.00 },
{2, '2016-03-03T00:00:00+00:00', 120.00 },

{3, '2016-03-01T00:00:00+00:00', 10.50 },
{3, '2016-03-02T00:00:00+00:00', 20.10 },
{3, '2016-03-03T00:00:00+00:00', 30.00 }