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我正在尝试使用 connect by 递归获取一些数据，对于每一行，我需要知道在不同的树中是否包含特定项目。

所以我有这个[精简]查询：

select m.id, m.name,
   (select (
    with recursiveMetaClass as (
            select mb.name
            from meta mb
            start with mb.id = m.id
            connect by prior mb.metaclass = mb.id and mb.metaclass <> mb.id
    ) select name from recursiveMetaClass where name in ('config_group', 'config_item')
   ) from dual) as basetype
from meta m
inner join meta_rel mr on mr.rel2 = m.id
start with m.name = 'store_sys'
connect by prior m.id = mr.rel1
order siblings by item_order;

尽管 ORA-00904 "M"."ID": invalid identifier on m.id in start with 在我的嵌套查询中，但此错误。如果我将查询替换为：

select m.id, m.name,
   (select (
    with recursiveMetaClass as (
            select mb.name
            from meta mb
            start with mb.id = 1004
            connect by prior mb.metaclass = mb.id and mb.metaclass <> mb.id
    ) select name from recursiveMetaClass where name in ('config_group', 'config_item')
   ) from dual) as basetype
from meta m
inner join meta_rel mr on mr.rel2 = m.id
start with m.name = 'store_sys'
connect by prior m.id = mr.rel1
order siblings by item_order;

它有效（只是给出错误的结果）。

我怎样才能让 m.id 开始，或者重构它来工作？我还尝试使用一些嵌套选择并按级别 desc 执行 where on rownumber = 1 order，但是在尝试引用 m.id 时出现完全相同的错误。

谢谢！

4

1 回答 1

2

您不能将此查询简化为以下内容吗？

select m.id, m.name, 
(      select mb.name  
       from meta mb 
       where name in ('config_group', 'config_item') 
       start with mb.id = m.id 
       connect by prior mb.metaclass = mb.id and mb.metaclass <> mb.id 
) as basetype
from meta m  
inner join meta_rel mr on mr.rel2 = m.id 
start with m.name = 'store_sys' 
connect by prior m.id = mr.rel1 
order siblings by item_order;
于 2012-03-26T20:14:54.557 回答