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我有一个如下所示的分层表。我想FLAG根据CODE值设置属性。可能的代码值为R、NR和。将设置为iff 对应的 code 值与 parent 的一致 ieRNNFFLAG'Y'

if parent.code = 'R' and child.code = 'R' then flag = 'Y'
if parent.code = 'NR' and child.code = 'NR' then flag = 'Y'
if parent.code = 'RNR' and child.code = 'R' or 'NR', then flag = 'Y'.

这是我的桌子：

create table My_BOM(assign_Id varchar2(50) not null primary key, 
parent_assign_Id varchar2(50) references My_BOM(assign_Id), 
code varchar2(50) not null, 
flag varchar2(1) default 'Y');


insert into my_bom values ('T1',null,'RNR','Y');
insert into my_bom values ('T2','T1','R','Y');
insert into my_bom values ('T3','T2','NR','Y');
insert into my_bom values ('T4','T3','R','Y');
insert into my_bom values ('T5','T1','NF','Y');
insert into my_bom values ('T6','T5','R','Y');
insert into my_bom values ('T7','T1','NR','Y');
insert into my_bom values ('T8','T7','RNR','Y');
insert into my_bom values ('T9','T8','R','Y');
insert into my_bom values ('T10','T1','RNR','Y');

如何设置FLAG？这就是我尝试过的方式，但是这个查询也返回了我不想要的 T9 记录，因为链在两者之间断开，即它们在CODE. 所以，T9 不应该是结果的一部分。

select connect_by_root(assign_Id), assign_Id desc_assign_Id, code, flag
from my_bom
where
--exists (select null from my_bom mb where mb.parent_assign_Id = prior my_bom.assign_Id 
--connect by mb.parent_assign_Id = prior mb.assign_Id) and 
DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL) = PRIOR DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL)
  start with parent_assign_Id is null
connect by parent_assign_Id = prior assign_Id
order by desc_assign_Id;

"bind_var"将是'R'或 'NR'

这是 SQL 小提琴：http ://sqlfiddle.com/#!4/009ad/2/0

4

1 回答 1

1

我不确定我是否理解正确，但您可以将条件移至connect by子句以过滤掉整个层次结构中的不一致（相对于最后一对父/子）

select connect_by_root(assign_Id), assign_Id desc_assign_Id, code, flag
from my_bom
connect by parent_assign_Id = prior assign_Id
and DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL) = PRIOR DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL)
start with parent_assign_Id is null
order by desc_assign_Id;

where parent_assign_Id is not null如果您不想要 root也可以添加：

select connect_by_root(assign_Id), assign_Id desc_assign_Id, code, flag
from my_bom
where parent_assign_Id is not null    
connect by parent_assign_Id = prior assign_Id
and DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL) = PRIOR DECODE( CODE,
  'R', 'R', 'NR', 'NR', 'RNR',
  :bind_var, NULL)
start with parent_assign_Id is null
order by desc_assign_Id;

复合connect by条件应该适用于 Oracle 10g，我只测试了 11g

于 2013-05-21T18:17:52.567 回答