显示连接到其他数据的唯一SQL记录

Question

我正在尝试编写SQL来检索我环境中所有Windows 10设备的列表，以及它们是否安装了Acrobat Reader。

我希望每个设备只返回一行，并且“是”或“否”表示是否已安装Reader。

到目前为止，我有：

SELECT distinct
    SV.Netbios_Name0,
CASE
    WHEN ARP.DisplayName0 LIKE '%Acrobat Reader%' THEN
        'Yes'
    ELSE
        'No'
    END as 'Has Reader',
    ARP.DisplayName0
FROM 
    dbo.v_R_System_Valid as SV
    JOIN dbo.v_Add_Remove_Programs as ARP
        on SV.ResourceID = ARP.ResourceID
    JOIN dbo.v_GS_OPERATING_SYSTEM as OS
        on SV.ResourceID = OS.ResourceID
WHERE
    OS.Caption0 LIKE '%Windows 10%'
GROUP BY
    SV.Netbios_Name0,
    ARP.DisplayName0,
    OS.Caption0

问题是每个设备上的每个已安装应用程序都会返回一行：

谢谢！

Answer 1

您需要从DisplayName0（以及GROUP BY）中删除SELECT列。这应该做：

SELECT 
    SV.Netbios_Name0,
    MAX(CASE
            WHEN ARP.DisplayName0 LIKE '%Acrobat Reader%' THEN
                'Yes'
            ELSE
                'No'
        END) [Has Reader]
FROM 
    dbo.v_R_System_Valid as SV
    JOIN dbo.v_Add_Remove_Programs as ARP
        on SV.ResourceID = ARP.ResourceID
    JOIN dbo.v_GS_OPERATING_SYSTEM as OS
        on SV.ResourceID = OS.ResourceID
WHERE
    OS.Caption0 LIKE '%Windows 10%'
GROUP BY
    SV.Netbios_Name0;