选择父行并包括子项成本

如何解决选择父行并包括子项成本

我有一个包含父级和子级WO的WORKORDER表：

def get_largest_city():
    max_population = max(this_dict.items(),key=lambda item: int(item[1]["population"]))
    return max_population[1]["capital"]

---

我想选择父级行，并在父级中包括子级的成本：

with workorder as (
select 'WO37342' as wonum,null as parent,297.36 as actlabcost,200 as actmatcost,0 as actservcost,0 as acttoolcost from dual
union all
select 'WO37427' as wonum,'WO37342' as parent,99.12 as actlabcost,0 as actmatcost,0 as acttoolcost from dual
union all
select 'WO37429' as wonum,100 as actmatcost,0 as acttoolcost from dual
)
select
    * 
from
    workorder

 WONUM   PARENT  ACTLABCOST ACTMATCOST ACTSERVCOST ACTTOOLCOST
 ------- ------- ---------- ---------- ----------- -----------
 WO37342             297.36        200           0           0
 WO37427 WO37342      99.12          0           0           0
 WO37429 WO37342      99.12        100           0           0

---

在Oracle 18c中是否有一种简洁的方法？

（我的目标是使sql尽可能简单/可读。）

解决方法

对于一级父母/子女关系，如您的示例数据所示，我建议：

select  
    coalesce(parent,wonum) wonum
    sum(actlabcost)  actlabcost,sum(actmatcost)  actmatcost,sum(actservcost) actservcost,sum(acttoolcost) acttoolcost
from workorder wo
group by coalesce(parent,wonum)

,

对于具有多个级别的层次结构，您可以使用CONNECT_BY_ROOT( ... )，然后使用GROUP BY：

SELECT root_wonum AS wonum,SUM( actlabcost ) AS total_actlabcost,SUM( actmatcost ) AS total_actmatcost,SUM( actservcost ) AS total_actservcost,SUM( acttoolcost ) AS total_acttoolcost
FROM   (
  SELECT CONNECT_BY_ROOT( wonum ) AS root_wonum,actlabcost,actmatcost,actservcost,acttoolcost
  FROM   workorder
  START WITH parent IS NULL
  CONNECT BY PRIOR wonum = parent
)
GROUP BY root_wonum;

其中，用于测试数据：

CREATE TABLE workorder ( wonum,parent,acttoolcost ) as
select 'WO37342',null,297.36,200,0 from dual union all
select 'WO37427','WO37342',99.12,0 from dual union all
select 'WO37429',100,0 from dual;

输出：

WONUM   | TOTAL_ACTLABCOST | TOTAL_ACTMATCOST | TOTAL_ACTSERVCOST | TOTAL_ACTTOOLCOST
:------ | ---------------: | ---------------: | ----------------: | ----------------:
WO37342 |            495.6 |              300 |                 0 |                 0

db 提琴here