Oracle SQL-子查詢

Question

我在EM中做報告，我需要弄清楚這里的東西

我有這個查詢：

SELECT
*
FROM
(
    SELECT DISTINCT
    patch.host as "PHost",
    patch.home_location as "PDirectory",
    patch.home_name as "PHome",
    MAX(patch.INSTALLATION_TIME) as "Patched (Date)",
    MAX(patch.PATCH_RELEASE) as "PVersion",
    listagg(patch,',') WITHIN GROUP (ORDER BY patch) "Patches"
    FROM
    mgmt$applied_patches patch
    GROUP BY patch.host, patch.home_location,patch.home_name
    ORDER BY patch.host, patch.home_location
) "PCH",
(
    SELECT DISTINCT 
    T1.PROPERTY_VALUE as "MHost",
    T2.PROPERTY_VALUE as "MDirectory",
    T3.PROPERTY_VALUE as "MVersion",
    count(T4.PROPERTY_VALUE) as "Count of SID",
    listagg(T4.PROPERTY_VALUE,',') WITHIN GROUP (ORDER BY T4.PROPERTY_VALUE) as "SID"
    FROM
    MGMT$TARGET_PROPERTIES T1,
    MGMT$TARGET_PROPERTIES T2,
    MGMT$TARGET_PROPERTIES T3,
    MGMT$TARGET_PROPERTIES T4
    WHERE
    T1.TARGET_GUID = T2.TARGET_GUID
    and T1.TARGET_GUID = T3.TARGET_GUID
    and T1.TARGET_GUID = T4.TARGET_GUID
    and T1.PROPERTY_NAME = 'MachineName'
    and T2.PROPERTY_NAME = 'OracleHome'
    and T3.PROPERTY_NAME = 'Version'
    and T4.PROPERTY_NAME = 'SID'
    GROUP BY T1.PROPERTY_VALUE, T2.PROPERTY_VALUE, T3.PROPERTY_VALUE
) "MGM"
WHERE
PDirectory = MDirectory

我收到錯誤ORA-00904：“ MDIRECTORY”：..

我嘗試了很多組合！ （PCH.PDirectory = MGM.MDirectory，......）無效

干杯

Answer 1

Oracle中的大小寫混合名稱令人討厭，您剛剛被它們咬了。

采用：

"PDirectory" = "MDirectory"

..或更好的是不要使用需要引用的特殊名稱。

Answer 2

好...

這不起作用：

SELECT * FROM
(SELECT DUMMY AS  "PDirectory" FROM DUAL) "PCH",
(SELECT DUMMY AS  "MDirectory" FROM DUAL) "MGR"
WHERE PDIRECTORY = MDIRECTORY

但這有效：

SELECT * FROM
(SELECT DUMMY AS  "PDirectory" FROM DUAL) "PCH",
(SELECT DUMMY AS  "MDirectory" FROM DUAL) "MGR"
where "PCH"."PDirectory" = "MGR"."MDirectory"

相應地更改查詢。