PL SQL /Oracle 中的这个 CTE WITH 子句有什么问题？

Question

我有以下查询。 下面的查询 WITH CTE，它返回 4 条记录。

正如我给出的 cmets，下面的 Select 查询有 55 条记录，并且使用 And 子句应该删除这 4 条记录并返回 51 条记录。相反，它只返回这 4 条记录。

只是为了测试，我评论了那个 AND 子句，然后它按预期运行并返回 55+4 = 总共 59 条记录。

如何通过 CTE 解决此问题。怎么了？

CREATE OR REPLACE PROCEDURE CUSTCONNECT.sp_GetPodConfigurationGridData( 
p_podURL            IN varchar2,  --PodUrl
p_serverType        IN varchar2,
p_serverName        IN varchar2,
p_publishedDate     IN date,
P_RECORDSET         OUT SYS_REFCURSOR 
)
AS
BEGIN
OPEN P_RECORDSET FOR

--This has total of 4 Records
WITH PodServerRecords(Key, value, Overwrite, ServerName, ServerType, PublishDate ) AS (    
 select
         PC.KeyId as Key, KeyIdValue as value, 'Pod' as Overwrite, ''  as ServerName,  '' as Servertype, PC.PublishDate 
    from (select 
            Keylog.*, row_number() over (partition by Keylog.KeyId order by Keylog.PublishDate desc) as RowNu
          from PodConfigLog_Tab Keylog
          where Keylog.URL = p_podURL 
          and Keylog.PublishDate >= p_publishedDate and Keylog.PublishDate <= sysdate 
          ) PC 
    where PC.RowNu = 1 and PC.IsActive = 'T'
    UNION
    select 
        PCBS.KeyId as Key, KeyIdValue as value, 'Server' as Overwrite,  PCBS.ServerName, Servertype, PCBS.PublishDate
    from (select 
            Serlog.*, PS.ServerType, row_number() over (partition by Serlog.KeyId order by Serlog.PublishDate desc) as RowNu
          from PodConfigByServerLog_Tab Serlog 
          join PodServer_tab PS on PS.ServerName = Serlog.ServerName 
          and Serlog.URL = PS.URL
          where Serlog.URL = p_podURL 
          and Serlog.ServerName = p_serverName 
          and Serlog.PublishDate >= p_publishedDate and Serlog.PublishDate <= sysdate 
          ) PCBS 
    where PCBS.RowNu = 1 and PCBS.IsActive = 'T'

)

    --This has total of 55 Records 
    select
        PCK.KeyId as Key ,DefaultKeyIdValue as value,'Default' as Overwrite, '' as ServerName,  '' as Servertype, PCK.PublishDate
    from 
        (select 
            Keylog.*, row_number() over (partition by Keylog.KeyId order by Keylog.PublishDate desc) as RowNu
          from PodConfigKeyLog_Tab Keylog
          where Keylog.PublishDate >= p_publishedDate and Keylog.PublishDate <= sysdate 
          ) PCK
    join POD_TAB PS on PS.URL = p_podURL
    where PCK.RowNu = 1 and PCK.IsActive = 'T'
    --This And caluse should remove those 4 Records and total Records should be 51. 
    and PCK.KeyId not in (
        select KeyId
        from PodServerRecords 
    )
    UNION
    --This is total of 4 Records
    SELECT 
        Key, value, Overwrite, ServerName, ServerType, PublishDate
    FROM PodServerRecords 
    Order By Key;

END;
/

Answer 1

您的问题是 CTE 没有名为 KeyId 的列。您将其重命名为 Key。但是，当存在 NULL 值时，NOT IN 会出现意外行为。您可以通过直接消除它们来解决此问题：

PCK.KeyId not in (
        select psr.KeyId
        from PodServerRecords psr
        where psr.KeyId IS NOT NULL 
    )

我建议改用NOT EXISTS：

NOT EXISTS (select 1
            from PodServerRecords psr
            where psr.KeyId = PCK.KeyId
           )

这可能会解决您的问题。

实际上，我在您的 CTE 中没有看到 KeyId。所以，我想你想要：

NOT EXISTS (select 1
            from PodServerRecords psr
            where psr.Key = PCK.KeyId
           )

注意前面的语句会返回错误，说明问题是列名错误。

Answer 2

我认为您应该删除查询中的 UNION 部分，因为它正在从 PodServerRecords 读取这 4 条记录。您的查询应该是

 --This has total of 55 Records 

    select
        PCK.KeyId as Key ,DefaultKeyIdValue as value,'Default' as Overwrite, '' as ServerName,  '' as Servertype, PCK.PublishDate
    from 
        (select 
            Keylog.*, row_number() over (partition by Keylog.KeyId order by Keylog.PublishDate desc) as RowNu
          from PodConfigKeyLog_Tab Keylog
          where Keylog.PublishDate >= p_publishedDate and Keylog.PublishDate <= sysdate 
          ) PCK
    join POD_TAB PS on PS.URL = p_podURL
    where PCK.RowNu = 1 and PCK.IsActive = 'T'
    --This And caluse should remove those 4 Records and total Records should be 51. 
    and PCK.KeyId not in (
        select KeyId
        from PodServerRecords 
    );