访问使用连接通过在Oracle中的子句中的子查询中的父别名

Question

我试图递归地获取一些数据使用连接，我需要知道是否在不同的树中包含特定项目。

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; 

这错误虽与ORA-00904 “M”， “ID”：在开始m.id无效的，在我的嵌套查询。如果我用以下查询替换：

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; 

它的工作原理（只是给出了错误的结果）。

我怎样才能让m.id进入那个开始，或重构这个工作？我也尝试使用一些嵌套的选择，并通过级别desc做rownumber = 1的顺序，但是当我试图引用m.id时，我得到了完全相同的错误。

谢谢！

Answer 1

难道你不能简化这个查询以下？

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;