在SQL中使用嵌套select语句有困难

我正在尝试创建一个ConfigMgr报告，该报告将显示我们环境中每个笔记本电脑的3个注册表项值。我的查询如下所示：

Select distinct

SYS.Netbios_Name0,
(Select REG.Value0 where REG.KeyPath0='HKEY_LOCAL_MACHINE\SOFTWARE\BatteryDesignCapacity' ) as BatteryDesignCapacity,
(Select REG.Value0 where REG.KeyPath0='HKEY_LOCAL_MACHINE\SOFTWARE\BatteryFullChargedCapacity' ) as BatteryFullChargedCapacity,
(Select REG.Value0 where REG.KeyPath0='HKEY_LOCAL_MACHINE\SOFTWARE\BatteryHealth' ) as BatteryHealth

from v_GS_Registry_Values0 REG

INNER JOIN v_R_System_Valid SYS
ON SYS.ResourceID = REG.ResourceID

ORDER BY SYS.Netbios_Name0

然而，当我运行该报告时，每个笔记本电脑名称对应4行。一行包含笔记本电脑名称和所有空白注册表值，下一行仅包含BatteryDesignCapacity值，第三行仅包含BatteryFullChargedCapacity，第四行仅包含BatteryHealth

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我做错了什么？是否可以通过修改select语句将所有4个注册表值放在一行中？

似乎每台计算机都有多行注册表值0。 您可以试试这个，或者使用SQLPivot函数

SELECT  DISTINCT
        SYS.Netbios_Name0
        ,MAX(   CASE
                    WHEN REG.KeyPath0 = 'HKEY_LOCAL_MACHINE\SOFTWARE\BatteryDesignCapacity' THEN REG.Value0
                END
            ) AS BatteryDesignCapacity
        ,MAX(   CASE
                    WHEN REG.KeyPath0 = 'HKEY_LOCAL_MACHINE\SOFTWARE\BatteryFullChargedCapacity' THEN REG.Value0
                END
            ) AS BatteryFullChargedCapacity
        ,MAX(   CASE
                    WHEN REG.KeyPath0 = 'HKEY_LOCAL_MACHINE\SOFTWARE\BatteryHealth' THEN REG.Value0
                END
            ) AS BatteryHealth
FROM    v_GS_Registry_Values0 AS REG
        INNER JOIN v_R_System_Valid AS SYS ON SYS.ResourceID = REG.ResourceID
GROUP BY
        SYS.Netbios_Name0;

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我认为您需要条件聚合：

SELECT SYS.Netbios_Name0,
       MAX(CASE WHEN REG.KeyPath0 = 'HKEY_LOCAL_MACHINE\SOFTWARE\BatteryDesignCapacity' THEN REG.Value0  END) as BatteryDesignCapacity,
       MAX(CASE WHEN REG.KeyPath0 = 'HKEY_LOCAL_MACHINE\SOFTWARE\BatteryFullChargedCapacity' THEN REG.Value0 END) as BatteryFullChargedCapacity,
       MAX(CASE WHEN REG.KeyPath0 ='HKEY_LOCAL_MACHINE\SOFTWARE\BatteryHealth' THEN REG.Value0 END) as BatteryHealth
FROM v_GS_Registry_Values0 REG INNER JOIN
     v_R_System_Valid SYS
     ON SYS.ResourceID = REG.ResourceID
GROUP BY SYS.Netbios_Name0
ORDER BY SYS.Netbios_Name0