Maximo 分类汇总查询

Question

Maximo 资产管理 7.6.1.2；甲骨文 19c：

我想在 db 视图中总结 CLASSSTRUCTURE 和 CLASSUSEWTIH 表如下：

• CLASSSTRUCTUREID
• 级别编号
• LEVEL_COUNT
• 分类 ID
• HIERARCHYPATH（CLASSSTRUCTURE 中现有的自定义持久字段）
• 家长
• TOP_CLASSSTRUCTUREID
• TOP_CLASSIFICATIONID
• 使用

如何使用 Oracle SQL 做到这一点？

Answer 1

我可以使用Oracle分层查询（CONNECT BY）：

--create or replace view cgclassstructure_vw as (
select
    cl.classstructureid,
    level as pseudo_level, --the CLASSANCESTOR table already has an OOB HIERARCHYLEVEL column. But the level numbers in that column are in reverse-order (sorted descending) and the level numbers start at 0 instead of 1 -- which isn't what we want.
    count(level) over (partition by connect_by_root(cl.classificationid)) as level_count,
    cl.classificationid,
    cl.description,
    cl.cghierarchypath,
    --ltrim(sys_connect_by_path(cl.classificationid, ' \ '),' \ ') as hierarchypath,
    cl.parent,
    cl.haschildren,
    connect_by_root(cl.classstructureid) as top_classstructureid,
    connect_by_root(cl.classificationid) as top_classificationid,
    uw.usewith,
    cl.cgactive
from 
    maximo.classstructure cl
left join
    (
    select 
        classstructureid,
        listagg(objectname,', ') within group(order by objectname) as usewith
    from 
        maximo.classusewith
    group by 
        classstructureid
    ) uw
    on cl.classstructureid = uw.classstructureid
start with cl.parent is null
connect by prior cl.classstructureid = parent
order by
    top_classstructureid,  --handles scenarios like the FACILITIES classifications -- we have top-level FACILITIES classifications for both ASSET and WO (different sets of classifications)
    cghierarchypath
--)