Oracle树形统计--子节点汇总到父节点

初始的树形数据状态：
|--2(0)--4(100)
0--1(0)--|

|--3(0)--5(200)

汇总后的树形数据状态：
|--2(100)--4(100)
0--1(300)--|
|--3(200)--5(200)

create table t
(
id number,
parent_id number,
value number
);
insert into t values(1,0);
insert into t values(2,1,0);
insert into t values(3,0);
insert into t values(4,2,100);
insert into t values(5,3,200);
commit;

sql> select * from t order by id asc;
ID PARENT_ID VALUE
---- ---------- ----------
1 0 0
2 1 0
3 1 0
4 2 100

5 3 200

sql> with ttt as (select t.*,SYS_CONNECT_BY_PATH(id,'/')||'/' path from t start with t.parent_id=0 connect by prior t.id= t.parent_id) SELECT id,parent_id,value,(SELECT SUM(value) FROM ttt WHERE path like t1.path || '%') s_value FROM ttt T1; ID PARENT_ID VALUE S_VALUE ---- ---------- ---------- ---------- 1 0 0 300 2 1 0 100 4 2 100 100 3 1 0 200 5 3 200 200