oracle 同一张表 数据是树形结构
fid(主键) parentid(父ID) fpath(节点全路径)
1 1
2 1 1/2
3 1 1/3
4 2 1/2/4
但是现有数据是用excel导入的 fpath 是空值，现在想写条语句把 fpath全都加上，求语句
建表及数百据
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create table test
(fid int,
parentid int,
fpath varchar2(100));insert into test values (1,null,null);
insert into test values (2,1,null);
insert into test values (3,1,null);
insert into test values (4,2,null);
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执行更度新版语句
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update test a set a.fpath=
(select b.fpath from
(select fid,parentid,
substr(sys_connect_by_path(fid,'/'),2) fpath
from test
start with fid=1
connect by prior fid=parentid) b
where a.fid=b.fid);
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效果截图权
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CREATE TABLE temp (
fid int,
parentid int,
fpath varchar(20)
);insert into temp (fid, parentid) values(1, null);
insert into temp (fid, parentid) values(2, 1);
insert into temp (fid, parentid) values(3, 1);
insert into temp (fid, parentid) values(4, 2);
update temp
set fpath = (
SELECT fpath from
(
START WITH tt.parentid is null
CONNECT BY PRIOR tt.fid = tt.parentid
) t
where t.fid = temp.fid
);
已更新e68a84e8a2ad7a64313333326432354行。SQL> select * from temp;
FID PARENTID FPATH
---------- ---------- ---------------------------------------- 1 1
2 1 1/2
3 1 1/3
4 2 1/2/4
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