我正在尝试使用 connect by 递归地获取一些数据,对于每一行,我需要知道不同的树中是否包含特定的项目。
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;
虽然 ORA-00904 "M"."ID": invalididentifier on m.id in start with 在我的嵌套查询中出现此错误。如果我用查询替换为:
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(只是给出了错误的结果)。
我怎样才能将 m.id 纳入其中,或者重构它以使其工作?我还尝试使用一些嵌套选择并执行 where on rownumber = 1 order by level desc,但是在尝试引用 m.id 时,我得到了完全相同的错误。
谢谢!
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;