Oracle 11g分层查询需要一些继承的数据
表看起来有点像：Oracle 11g分层查询需要一些继承的数据,oracle,hierarchy,Oracle,Hierarchy,表看起来有点像： create table taco ( taco_id int primary key not null, taco_name varchar(255), taco_prntid int, meat_id int, meat_inht char(1) -- inherit meat ) 数据如下所示： insert into taco values (1, '1', null,
create table taco (
taco_id int primary key not null,
taco_name varchar(255),
taco_prntid int,
meat_id int,
meat_inht char(1) -- inherit meat
)
insert into taco values (1, '1', null, 1, 'N');
insert into taco values (2, '1.1', 1, null, 'Y');
insert into taco values (3, '1.1.1', 2, null, 'N');
insert into taco values (4, '1.2', 1, 2, 'N');
insert into taco values (5, '1.2.1', 4, null, 'Y');
insert into taco values (6, '1.1.2', 2, null, 'Y');
- 1 has a meat_id=1
- 1.1 has a meat_id=1 because it inherits from its parent via taco_prntid=1
- 1.1.1 has a meat_id of null because it does NOT inherit from its parent
- 1.2 has a meat_id=2 and it does not inherit from its parent
- 1.2.1 has a meat_id=2 because it does inherit from its parent via taco_prntid=4
- 1.1.2 has a meat_id=1 because it does inherit from its parent via taco_prntid=2
现在。。。我究竟该如何查询每个
taco\u idmeat\u idselect x.taco_id,
x.taco_name,
to_number(substr(meat_id,instr(rtrim(meat_id), ' ', -1)+1)) as meat_id
from ( select taco_id,
taco_name,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
) x
我自己在底部贴了一个答案，以显示我最终得到了什么。我将另一个答案保留为已接受，因为他们能够让我更清楚地了解数据，如果没有它，我将一事无成。您的内部查询是正确的。当flag为Y时，只需从内部查询的meat_id列中选择最右边的数字。 我使用了REGEXP_SUBSTR函数来获取最右边的number和CASE语句来检查标志 查询1：
select taco_id,
taco_name,
taco_prntid,
case meat_inht
when 'N' then meat_id
when 'Y' then to_number(regexp_substr(meat_id2,'\d+\s*$'))
end meat_id,
meat_inht
from ( select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
)
order by 1
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT |
|---------|-----------|-------------|---------|-----------|
| 1 | 1 | (null) | 1 | N |
| 2 | 1.1 | 1 | 1 | Y |
| 3 | 1.1.1 | 2 | (null) | N |
| 4 | 1.2 | 1 | 2 | N |
| 5 | 1.2.1 | 4 | 2 | Y |
| 6 | 1.1.2 | 2 | 1 | Y |
select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT | LEVEL | MEAT_ID2 |
|---------|-----------|-------------|---------|-----------|-------|----------|
| 1 | 1 | (null) | 1 | N | 0 | 1 |
| 2 | 1.1 | 1 | (null) | Y | 1 | 1 |
| 3 | 1.1.1 | 2 | (null) | N | 2 | 1 |
| 6 | 1.1.2 | 2 | (null) | Y | 2 | 1 |
| 4 | 1.2 | 1 | 2 | N | 1 | 1 2 |
| 5 | 1.2.1 | 4 | (null) | Y | 2 | 1 2 |
select taco_id,
taco_name,
taco_prntid,
case meat_inht
when 'N' then meat_id
when 'Y' then to_number(regexp_substr(meat_id2,'\d+\s*$'))
end meat_id,
meat_inht
from ( select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
)
order by 1
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT |
|---------|-----------|-------------|---------|-----------|
| 1 | 1 | (null) | 1 | N |
| 2 | 1.1 | 1 | 1 | Y |
| 3 | 1.1.1 | 2 | (null) | N |
| 4 | 1.2 | 1 | 2 | N |
| 5 | 1.2.1 | 4 | 2 | Y |
| 6 | 1.1.2 | 2 | 1 | Y |
select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT | LEVEL | MEAT_ID2 |
|---------|-----------|-------------|---------|-----------|-------|----------|
| 1 | 1 | (null) | 1 | N | 0 | 1 |
| 2 | 1.1 | 1 | (null) | Y | 1 | 1 |
| 3 | 1.1.1 | 2 | (null) | N | 2 | 1 |
| 6 | 1.1.2 | 2 | (null) | Y | 2 | 1 |
| 4 | 1.2 | 1 | 2 | N | 1 | 1 2 |
| 5 | 1.2.1 | 4 | (null) | Y | 2 | 1 2 |
select taco_id,
taco_name,
taco_prntid,
case meat_inht
when 'N' then meat_id
when 'Y' then to_number(regexp_substr(meat_id2,'\d+\s*$'))
end meat_id,
meat_inht
from ( select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
)
order by 1
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT |
|---------|-----------|-------------|---------|-----------|
| 1 | 1 | (null) | 1 | N |
| 2 | 1.1 | 1 | 1 | Y |
| 3 | 1.1.1 | 2 | (null) | N |
| 4 | 1.2 | 1 | 2 | N |
| 5 | 1.2.1 | 4 | 2 | Y |
| 6 | 1.1.2 | 2 | 1 | Y |
select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT | LEVEL | MEAT_ID2 |
|---------|-----------|-------------|---------|-----------|-------|----------|
| 1 | 1 | (null) | 1 | N | 0 | 1 |
| 2 | 1.1 | 1 | (null) | Y | 1 | 1 |
| 3 | 1.1.1 | 2 | (null) | N | 2 | 1 |
| 6 | 1.1.2 | 2 | (null) | Y | 2 | 1 |
| 4 | 1.2 | 1 | 2 | N | 1 | 1 2 |
| 5 | 1.2.1 | 4 | (null) | Y | 2 | 1 2 |
select taco_id,
taco_name,
taco_prntid,
case meat_inht
when 'N' then meat_id
when 'Y' then to_number(regexp_substr(meat_id2,'\d+\s*$'))
end meat_id,
meat_inht
from ( select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
)
order by 1
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT |
|---------|-----------|-------------|---------|-----------|
| 1 | 1 | (null) | 1 | N |
| 2 | 1.1 | 1 | 1 | Y |
| 3 | 1.1.1 | 2 | (null) | N |
| 4 | 1.2 | 1 | 2 | N |
| 5 | 1.2.1 | 4 | 2 | Y |
| 6 | 1.1.2 | 2 | 1 | Y |
select taco_id,
taco_name,
taco_prntid,
meat_id,
meat_inht,
level-1 "level",
sys_connect_by_path(meat_id, ' ') meat_id2
from taco
start with taco_prntid is null
connect by prior taco_id = taco_prntid
| TACO_ID | TACO_NAME | TACO_PRNTID | MEAT_ID | MEAT_INHT | LEVEL | MEAT_ID2 |
|---------|-----------|-------------|---------|-----------|-------|----------|
| 1 | 1 | (null) | 1 | N | 0 | 1 |
| 2 | 1.1 | 1 | (null) | Y | 1 | 1 |
| 3 | 1.1.1 | 2 | (null) | N | 2 | 1 |
| 6 | 1.1.2 | 2 | (null) | Y | 2 | 1 |
| 4 | 1.2 | 1 | 2 | N | 1 | 1 2 |
| 5 | 1.2.1 | 4 | (null) | Y | 2 | 1 2 |
这就是我到目前为止的结局。。。在接受的答案中应用逻辑后。我又添加了一些内容，以便将结果与我的
meatselect x.taco_id,
x.taco_name,
x.taco_prntname,
meat_id
,case when to_number(regexp_substr(meat_id,'\d+\s*$'))=0 then null else
to_number(regexp_substr(meat_id,'\d+\s*$')) end as meat_id
from ( select taco_id,
taco_name,
taco_prntname,
level-1 "level",
sys_connect_by_path(
case when meat_inht='N' then nvl(to_char(meat_id),'0') else '' end
,' ') meat_id
from taco join jobdtl on jobdtl.jobdtl_id=taco.jobdtl_id
start with taco_prntid is null
connect by prior taco_id = taco_prntid
) x
（当你读到这样的问题时，你有没有想过，真正的模式是什么？很明显，我不是在做一个玉米卷项目。或者，只要保留了一般的关系和概念，这就很重要了？这对你有帮助吗？我们错过了一个案子。但我认为看到这一点后，可能很容易处理。某个对象可能具有meat_id=1，然后子对象继承，下一个子对象不继承，但具有空值，然后下一个子对象继承空值。我需要一种方法来提取空值。所以我要做的就是。。。。是改变我所连接的。。。并使用。。。空间为空。。。而且。。。之后把它清理干净。