仅显示唯一值

Question

我正在使用SQL Server 2019，并且正在寻找一种仅基于每个AOC的最新FW_Version显示最新值的方法。这是我到目前为止的查询，但这显示了所有内容：

SELECT DISTINCT
    dbo.Model.ModelName AS AOC,
    dbo.Chipset.Chipset,
    dbo.FormFactor.FormFactor AS Form_Factor,
    dbo.ProductRelease.ECO AS Release,
    dbo.ProductRelease.Date AS Release_Date,
    dbo.Intel.FWVersion AS FW_Version,
    dbo.Intel.ETRACKID
FROM
    dbo.Intel
        INNER JOIN dbo.ProductRelease ON dbo.Intel.ProductReleaseID = dbo.ProductRelease.ID
        INNER JOIN dbo.Model ON dbo.ProductRelease.ModelID = dbo.Model.ID
        INNER JOIN dbo.FormFactor ON dbo.Model.FormFactorID = dbo.FormFactor.ID
        INNER JOIN dbo.Chipset ON dbo.Intel.ControllerID = dbo.Chipset.ControllerID AND dbo.Intel.ChipsetID = dbo.Chipset.ID
ORDER BY 
    dbo.Model.ModelName, 
    dbo.Intel.FWVersion DESC, 
    dbo.ProductRelease.Date DESC

我只想显示带有黄色标记的项目...我该如何实现？

这是我的表的列表，这些表根据其对应的ID进行连接

表1：模型

ID (Primary Key)
ModelName nvarchar(50)
FormFactorID int

表2：FormFactor

ID (Primary Key)
FormFactor nvarchar(15)

表3：ProductRelease

ID (Primary Key)
ModelID int
Date date
ECO nvarchar(10)

表4：英特尔

ID (Primary Key)
ProductReleaseID int
ChipsetID int
FWVersion nvarchar(10)
ETRACKID nvarchar(15)

表5：芯片组

ID (Primary Key)
Chipsetnvarchar(20)

Answer 1

一种方法使用窗口函数：

SELECT *
FROM (
    SELECT 
        dbo.Model.ModelName AS AOC,
        dbo.Chipset.Chipset,
        dbo.FormFactor.FormFactor AS Form_Factor,
        dbo.ProductRelease.ECO AS Release,
        dbo.ProductRelease.Date AS Release_Date,
        dbo.Intel.FWVersion AS FW_Version,
        dbo.Intel.ETRACKID,
        ROW_NUMBER() OVER(PARTITION BY dbo.Model.ModelName ORDER BY dbo.ProductRelease.Date DESC) rn
    FROM
        dbo.Intel
        INNER JOIN dbo.ProductRelease ON dbo.Intel.ProductReleaseID = dbo.ProductRelease.ID
        INNER JOIN dbo.Model ON dbo.ProductRelease.ModelID = dbo.Model.ID
        INNER JOIN dbo.FormFactor ON dbo.Model.FormFactorID = dbo.FormFactor.ID
        INNER JOIN dbo.Chipset ON dbo.Intel.ControllerID = dbo.Chipset.ControllerID AND dbo.Intel.ChipsetID = dbo.Chipset.ID
) t
WHERE rn = 1
ORDER BY AOC