sql查询oracle以适应树结构格式_Sql_Oracle_Hierarchical

sql查询oracle以适应树结构格式

sql oracle

sql查询oracle以适应树结构格式,sql,oracle,hierarchical,Sql,Oracle,Hierarchical,我创建这些示例表是为了创建json树结构，以便使用jqtree创建树布局我希望我的json格式为 [ {"id":1, "parentid": 0, "name": "Carnivores"}, {"id":2, "parentid": 0, "name": "Herbivores"}, {"id":3, "parentid": 1, "name": "Dogs"}, {"id":4, "parentid": 3, "name": "Labradors"}, {"id"

我创建这些示例表是为了创建json树结构，以便使用jqtree创建树布局

我希望我的json格式为

[
  {"id":1, "parentid": 0, "name": "Carnivores"},
  {"id":2, "parentid": 0, "name": "Herbivores"},
  {"id":3, "parentid": 1, "name": "Dogs"},
  {"id":4, "parentid": 3, "name": "Labradors"},  
  {"id":5, "parentid": 3, "name": "Pugs"},
  {"id":6, "parentid": 3, "name": "Terriers"}

]

各表如下

| catg_id       |   catg_name       | 
| —————-        |————————-          |
| 1             |   Carnivores      |
| 2             |   Herbivores      |



| animal_catg_id    | animal_catg_name      |   catg_id |
| —————-        |————————-                  |————————-  |
| 1             |   Dogs                    |   1       |
| 2             |   Cats                    |   1       |
| 3             |   Cows                    |   2       |
| 4             |   Buffalo                 |   2       |



| animal_id     | animal_name   | animal_catg_id    |
| —————-        |————————-      |   ————————-       |
| 1             |   labs        |   1               |
| 2             |   pugs        |   1               |
| 3             |   terriers    |   1               |
| 4             |   german      |   1               |
| 5             |   lion        |   2               |
| 6             |   tiger       |   2               |

我假设它是分层查询，我以前从未写过，我需要一些帮助。我不知道从哪里开始，怎么开始

编辑

答案中的一个评论是模式设计不清晰。我应该做什么更改才能以json格式获取数据，从而维护层次结构

EDIT2

我当前的查询返回这个表

Carnivores     |  Dogs    | labs
Carnivores     |  Dogs    | pugs
Carnivores     |  Dogs    | terriers
.......

以下是Oracle文档中的分层查询示例：

SELECT last_name, employee_id, manager_id, LEVEL
  FROM employees
  START WITH employee_id = 100
  CONNECT BY PRIOR employee_id = manager_id
  ORDER SIBLINGS BY last_name;

在您的案例中是这样的，但是您的模式设计不清楚

 SELECT animal_name, level
  FROM animals
  START WITH parentid is null
  CONNECT BY PRIOR id = parentid;

您提议的JSON在您分配的

ID

s与表中的

ID

s之间似乎没有关联，这将使从客户端连接任何内容回到数据库变得困难

你最好重新组织你的表格，这样你就可以把所有的东西都放在一个层次结构中。类似于林奈分类法：

Oracle 11g R2架构设置：

CREATE TABLE Taxonomies ( ID, PARENT_ID, Category, Taxonomy, Common_Name ) AS
          SELECT  1, CAST(NULL AS NUMBER),  'Kingdom',     'Animalia',    'Animal'       FROM DUAL
UNION ALL SELECT  2,  1,    'Phylum',      'Chordata',    'Chordate'     FROM DUAL
UNION ALL SELECT  3,  2,    'Class',       'Mammalia',    'Mammal'       FROM DUAL
UNION ALL SELECT  4,  3,    'Order',       'Carnivora',   'Carnivore'    FROM DUAL
UNION ALL SELECT  5,  4,    'Family',      'Felidae',     'Feline'       FROM DUAL
UNION ALL SELECT  6,  5,    'Genus',       'Panthera',    'Tiger'         FROM DUAL
UNION ALL SELECT  7,  5,    'Genus',       'Felis',       'Cat'           FROM DUAL
UNION ALL SELECT  8,  5,    'Genus',       'Lynx',        'Lynx'          FROM DUAL
UNION ALL SELECT  9,  4,    'Family',      'Canidae',     'Canid'        FROM DUAL
UNION ALL SELECT 10,  9,    'Genus',       'Canis',       'Canine'       FROM DUAL
UNION ALL SELECT 11, 10,    'Species',     'Canis Lupus', 'Gray Wolf'     FROM DUAL
UNION ALL SELECT 12, 11,    'Sub-Species', 'Canis Lupus Familiaris', 'Domestic Dog' FROM DUAL
UNION ALL SELECT 13, 12,    'Breed',       NULL,          'Pug'           FROM DUAL
UNION ALL SELECT 14, 12,    'Breed',       NULL,          'German Shepherd' FROM DUAL
UNION ALL SELECT 15, 12,    'Breed',       NULL,          'Labradors'     FROM DUAL
UNION ALL SELECT 16,  7,    'Species',     'Felis Catus', 'Domestic Cat'  FROM DUAL
UNION ALL SELECT 17,  8,    'Species',     'Lynx Lynx',   'Eurasian Lynx' FROM DUAL
UNION ALL SELECT 18,  8,    'Species',     'Lynx Rufus',  'Bobcat'        FROM DUAL;

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID | CATEGORY |    TAXONOMY |  COMMON_NAME |
|----|-----------|----------|-------------|--------------|
|  1 |    (null) |  Kingdom |    Animalia |       Animal |
|  2 |         1 |   Phylum |    Chordata |     Chordate |
|  3 |         2 |    Class |    Mammalia |       Mammal |
|  4 |         3 |    Order |   Carnivora |    Carnivore |
|  5 |         4 |   Family |     Felidae |       Feline |
|  7 |         5 |    Genus |       Felis |          Cat |
| 16 |         7 |  Species | Felis Catus | Domestic Cat |

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID |    CATEGORY |               TAXONOMY |     COMMON_NAME |
|----|-----------|-------------|------------------------|-----------------|
|  1 |    (null) |     Kingdom |               Animalia |          Animal |
|  2 |         1 |      Phylum |               Chordata |        Chordate |
|  3 |         2 |       Class |               Mammalia |          Mammal |
|  4 |         3 |       Order |              Carnivora |       Carnivore |
|  9 |         4 |      Family |                Canidae |           Canid |
| 10 |         9 |       Genus |                  Canis |          Canine |
| 11 |        10 |     Species |            Canis Lupus |       Gray Wolf |
| 12 |        11 | Sub-Species | Canis Lupus Familiaris |    Domestic Dog |
| 13 |        12 |       Breed |                 (null) |             Pug |
| 14 |        12 |       Breed |                 (null) | German Shepherd |
| 15 |        12 |       Breed |                 (null) |       Labradors |

然后，您可以相对简单地提取数据：

查询1-获取与“Cat”分类相关的所有内容：

CREATE TABLE Taxonomies ( ID, PARENT_ID, Category, Taxonomy, Common_Name ) AS
          SELECT  1, CAST(NULL AS NUMBER),  'Kingdom',     'Animalia',    'Animal'       FROM DUAL
UNION ALL SELECT  2,  1,    'Phylum',      'Chordata',    'Chordate'     FROM DUAL
UNION ALL SELECT  3,  2,    'Class',       'Mammalia',    'Mammal'       FROM DUAL
UNION ALL SELECT  4,  3,    'Order',       'Carnivora',   'Carnivore'    FROM DUAL
UNION ALL SELECT  5,  4,    'Family',      'Felidae',     'Feline'       FROM DUAL
UNION ALL SELECT  6,  5,    'Genus',       'Panthera',    'Tiger'         FROM DUAL
UNION ALL SELECT  7,  5,    'Genus',       'Felis',       'Cat'           FROM DUAL
UNION ALL SELECT  8,  5,    'Genus',       'Lynx',        'Lynx'          FROM DUAL
UNION ALL SELECT  9,  4,    'Family',      'Canidae',     'Canid'        FROM DUAL
UNION ALL SELECT 10,  9,    'Genus',       'Canis',       'Canine'       FROM DUAL
UNION ALL SELECT 11, 10,    'Species',     'Canis Lupus', 'Gray Wolf'     FROM DUAL
UNION ALL SELECT 12, 11,    'Sub-Species', 'Canis Lupus Familiaris', 'Domestic Dog' FROM DUAL
UNION ALL SELECT 13, 12,    'Breed',       NULL,          'Pug'           FROM DUAL
UNION ALL SELECT 14, 12,    'Breed',       NULL,          'German Shepherd' FROM DUAL
UNION ALL SELECT 15, 12,    'Breed',       NULL,          'Labradors'     FROM DUAL
UNION ALL SELECT 16,  7,    'Species',     'Felis Catus', 'Domestic Cat'  FROM DUAL
UNION ALL SELECT 17,  8,    'Species',     'Lynx Lynx',   'Eurasian Lynx' FROM DUAL
UNION ALL SELECT 18,  8,    'Species',     'Lynx Rufus',  'Bobcat'        FROM DUAL;

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID | CATEGORY |    TAXONOMY |  COMMON_NAME |
|----|-----------|----------|-------------|--------------|
|  1 |    (null) |  Kingdom |    Animalia |       Animal |
|  2 |         1 |   Phylum |    Chordata |     Chordate |
|  3 |         2 |    Class |    Mammalia |       Mammal |
|  4 |         3 |    Order |   Carnivora |    Carnivore |
|  5 |         4 |   Family |     Felidae |       Feline |
|  7 |         5 |    Genus |       Felis |          Cat |
| 16 |         7 |  Species | Felis Catus | Domestic Cat |

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID |    CATEGORY |               TAXONOMY |     COMMON_NAME |
|----|-----------|-------------|------------------------|-----------------|
|  1 |    (null) |     Kingdom |               Animalia |          Animal |
|  2 |         1 |      Phylum |               Chordata |        Chordate |
|  3 |         2 |       Class |               Mammalia |          Mammal |
|  4 |         3 |       Order |              Carnivora |       Carnivore |
|  9 |         4 |      Family |                Canidae |           Canid |
| 10 |         9 |       Genus |                  Canis |          Canine |
| 11 |        10 |     Species |            Canis Lupus |       Gray Wolf |
| 12 |        11 | Sub-Species | Canis Lupus Familiaris |    Domestic Dog |
| 13 |        12 |       Breed |                 (null) |             Pug |
| 14 |        12 |       Breed |                 (null) | German Shepherd |
| 15 |        12 |       Breed |                 (null) |       Labradors |

：

CREATE TABLE Taxonomies ( ID, PARENT_ID, Category, Taxonomy, Common_Name ) AS
          SELECT  1, CAST(NULL AS NUMBER),  'Kingdom',     'Animalia',    'Animal'       FROM DUAL
UNION ALL SELECT  2,  1,    'Phylum',      'Chordata',    'Chordate'     FROM DUAL
UNION ALL SELECT  3,  2,    'Class',       'Mammalia',    'Mammal'       FROM DUAL
UNION ALL SELECT  4,  3,    'Order',       'Carnivora',   'Carnivore'    FROM DUAL
UNION ALL SELECT  5,  4,    'Family',      'Felidae',     'Feline'       FROM DUAL
UNION ALL SELECT  6,  5,    'Genus',       'Panthera',    'Tiger'         FROM DUAL
UNION ALL SELECT  7,  5,    'Genus',       'Felis',       'Cat'           FROM DUAL
UNION ALL SELECT  8,  5,    'Genus',       'Lynx',        'Lynx'          FROM DUAL
UNION ALL SELECT  9,  4,    'Family',      'Canidae',     'Canid'        FROM DUAL
UNION ALL SELECT 10,  9,    'Genus',       'Canis',       'Canine'       FROM DUAL
UNION ALL SELECT 11, 10,    'Species',     'Canis Lupus', 'Gray Wolf'     FROM DUAL
UNION ALL SELECT 12, 11,    'Sub-Species', 'Canis Lupus Familiaris', 'Domestic Dog' FROM DUAL
UNION ALL SELECT 13, 12,    'Breed',       NULL,          'Pug'           FROM DUAL
UNION ALL SELECT 14, 12,    'Breed',       NULL,          'German Shepherd' FROM DUAL
UNION ALL SELECT 15, 12,    'Breed',       NULL,          'Labradors'     FROM DUAL
UNION ALL SELECT 16,  7,    'Species',     'Felis Catus', 'Domestic Cat'  FROM DUAL
UNION ALL SELECT 17,  8,    'Species',     'Lynx Lynx',   'Eurasian Lynx' FROM DUAL
UNION ALL SELECT 18,  8,    'Species',     'Lynx Rufus',  'Bobcat'        FROM DUAL;

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID | CATEGORY |    TAXONOMY |  COMMON_NAME |
|----|-----------|----------|-------------|--------------|
|  1 |    (null) |  Kingdom |    Animalia |       Animal |
|  2 |         1 |   Phylum |    Chordata |     Chordate |
|  3 |         2 |    Class |    Mammalia |       Mammal |
|  4 |         3 |    Order |   Carnivora |    Carnivore |
|  5 |         4 |   Family |     Felidae |       Feline |
|  7 |         5 |    Genus |       Felis |          Cat |
| 16 |         7 |  Species | Felis Catus | Domestic Cat |

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID |    CATEGORY |               TAXONOMY |     COMMON_NAME |
|----|-----------|-------------|------------------------|-----------------|
|  1 |    (null) |     Kingdom |               Animalia |          Animal |
|  2 |         1 |      Phylum |               Chordata |        Chordate |
|  3 |         2 |       Class |               Mammalia |          Mammal |
|  4 |         3 |       Order |              Carnivora |       Carnivore |
|  9 |         4 |      Family |                Canidae |           Canid |
| 10 |         9 |       Genus |                  Canis |          Canine |
| 11 |        10 |     Species |            Canis Lupus |       Gray Wolf |
| 12 |        11 | Sub-Species | Canis Lupus Familiaris |    Domestic Dog |
| 13 |        12 |       Breed |                 (null) |             Pug |
| 14 |        12 |       Breed |                 (null) | German Shepherd |
| 15 |        12 |       Breed |                 (null) |       Labradors |

查询2-获取与“犬科动物”分类相关的所有信息：

CREATE TABLE Taxonomies ( ID, PARENT_ID, Category, Taxonomy, Common_Name ) AS
          SELECT  1, CAST(NULL AS NUMBER),  'Kingdom',     'Animalia',    'Animal'       FROM DUAL
UNION ALL SELECT  2,  1,    'Phylum',      'Chordata',    'Chordate'     FROM DUAL
UNION ALL SELECT  3,  2,    'Class',       'Mammalia',    'Mammal'       FROM DUAL
UNION ALL SELECT  4,  3,    'Order',       'Carnivora',   'Carnivore'    FROM DUAL
UNION ALL SELECT  5,  4,    'Family',      'Felidae',     'Feline'       FROM DUAL
UNION ALL SELECT  6,  5,    'Genus',       'Panthera',    'Tiger'         FROM DUAL
UNION ALL SELECT  7,  5,    'Genus',       'Felis',       'Cat'           FROM DUAL
UNION ALL SELECT  8,  5,    'Genus',       'Lynx',        'Lynx'          FROM DUAL
UNION ALL SELECT  9,  4,    'Family',      'Canidae',     'Canid'        FROM DUAL
UNION ALL SELECT 10,  9,    'Genus',       'Canis',       'Canine'       FROM DUAL
UNION ALL SELECT 11, 10,    'Species',     'Canis Lupus', 'Gray Wolf'     FROM DUAL
UNION ALL SELECT 12, 11,    'Sub-Species', 'Canis Lupus Familiaris', 'Domestic Dog' FROM DUAL
UNION ALL SELECT 13, 12,    'Breed',       NULL,          'Pug'           FROM DUAL
UNION ALL SELECT 14, 12,    'Breed',       NULL,          'German Shepherd' FROM DUAL
UNION ALL SELECT 15, 12,    'Breed',       NULL,          'Labradors'     FROM DUAL
UNION ALL SELECT 16,  7,    'Species',     'Felis Catus', 'Domestic Cat'  FROM DUAL
UNION ALL SELECT 17,  8,    'Species',     'Lynx Lynx',   'Eurasian Lynx' FROM DUAL
UNION ALL SELECT 18,  8,    'Species',     'Lynx Rufus',  'Bobcat'        FROM DUAL;

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID | CATEGORY |    TAXONOMY |  COMMON_NAME |
|----|-----------|----------|-------------|--------------|
|  1 |    (null) |  Kingdom |    Animalia |       Animal |
|  2 |         1 |   Phylum |    Chordata |     Chordate |
|  3 |         2 |    Class |    Mammalia |       Mammal |
|  4 |         3 |    Order |   Carnivora |    Carnivore |
|  5 |         4 |   Family |     Felidae |       Feline |
|  7 |         5 |    Genus |       Felis |          Cat |
| 16 |         7 |  Species | Felis Catus | Domestic Cat |

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID |    CATEGORY |               TAXONOMY |     COMMON_NAME |
|----|-----------|-------------|------------------------|-----------------|
|  1 |    (null) |     Kingdom |               Animalia |          Animal |
|  2 |         1 |      Phylum |               Chordata |        Chordate |
|  3 |         2 |       Class |               Mammalia |          Mammal |
|  4 |         3 |       Order |              Carnivora |       Carnivore |
|  9 |         4 |      Family |                Canidae |           Canid |
| 10 |         9 |       Genus |                  Canis |          Canine |
| 11 |        10 |     Species |            Canis Lupus |       Gray Wolf |
| 12 |        11 | Sub-Species | Canis Lupus Familiaris |    Domestic Dog |
| 13 |        12 |       Breed |                 (null) |             Pug |
| 14 |        12 |       Breed |                 (null) | German Shepherd |
| 15 |        12 |       Breed |                 (null) |       Labradors |

：

CREATE TABLE Taxonomies ( ID, PARENT_ID, Category, Taxonomy, Common_Name ) AS
          SELECT  1, CAST(NULL AS NUMBER),  'Kingdom',     'Animalia',    'Animal'       FROM DUAL
UNION ALL SELECT  2,  1,    'Phylum',      'Chordata',    'Chordate'     FROM DUAL
UNION ALL SELECT  3,  2,    'Class',       'Mammalia',    'Mammal'       FROM DUAL
UNION ALL SELECT  4,  3,    'Order',       'Carnivora',   'Carnivore'    FROM DUAL
UNION ALL SELECT  5,  4,    'Family',      'Felidae',     'Feline'       FROM DUAL
UNION ALL SELECT  6,  5,    'Genus',       'Panthera',    'Tiger'         FROM DUAL
UNION ALL SELECT  7,  5,    'Genus',       'Felis',       'Cat'           FROM DUAL
UNION ALL SELECT  8,  5,    'Genus',       'Lynx',        'Lynx'          FROM DUAL
UNION ALL SELECT  9,  4,    'Family',      'Canidae',     'Canid'        FROM DUAL
UNION ALL SELECT 10,  9,    'Genus',       'Canis',       'Canine'       FROM DUAL
UNION ALL SELECT 11, 10,    'Species',     'Canis Lupus', 'Gray Wolf'     FROM DUAL
UNION ALL SELECT 12, 11,    'Sub-Species', 'Canis Lupus Familiaris', 'Domestic Dog' FROM DUAL
UNION ALL SELECT 13, 12,    'Breed',       NULL,          'Pug'           FROM DUAL
UNION ALL SELECT 14, 12,    'Breed',       NULL,          'German Shepherd' FROM DUAL
UNION ALL SELECT 15, 12,    'Breed',       NULL,          'Labradors'     FROM DUAL
UNION ALL SELECT 16,  7,    'Species',     'Felis Catus', 'Domestic Cat'  FROM DUAL
UNION ALL SELECT 17,  8,    'Species',     'Lynx Lynx',   'Eurasian Lynx' FROM DUAL
UNION ALL SELECT 18,  8,    'Species',     'Lynx Rufus',  'Bobcat'        FROM DUAL;

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Cat'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID | CATEGORY |    TAXONOMY |  COMMON_NAME |
|----|-----------|----------|-------------|--------------|
|  1 |    (null) |  Kingdom |    Animalia |       Animal |
|  2 |         1 |   Phylum |    Chordata |     Chordate |
|  3 |         2 |    Class |    Mammalia |       Mammal |
|  4 |         3 |    Order |   Carnivora |    Carnivore |
|  5 |         4 |   Family |     Felidae |       Feline |
|  7 |         5 |    Genus |       Felis |          Cat |
| 16 |         7 |  Species | Felis Catus | Domestic Cat |

SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR PARENT_ID = ID
  ORDER BY LEVEL DESC
)
UNION
SELECT *
FROM (
  SELECT *
  FROM   Taxonomies
  START WITH Common_Name = 'Canine'
  CONNECT BY PRIOR ID = PARENT_ID
  ORDER SIBLINGS BY Common_Name
)

| ID | PARENT_ID |    CATEGORY |               TAXONOMY |     COMMON_NAME |
|----|-----------|-------------|------------------------|-----------------|
|  1 |    (null) |     Kingdom |               Animalia |          Animal |
|  2 |         1 |      Phylum |               Chordata |        Chordate |
|  3 |         2 |       Class |               Mammalia |          Mammal |
|  4 |         3 |       Order |              Carnivora |       Carnivore |
|  9 |         4 |      Family |                Canidae |           Canid |
| 10 |         9 |       Genus |                  Canis |          Canine |
| 11 |        10 |     Species |            Canis Lupus |       Gray Wolf |
| 12 |        11 | Sub-Species | Canis Lupus Familiaris |    Domestic Dog |
| 13 |        12 |       Breed |                 (null) |             Pug |
| 14 |        12 |       Breed |                 (null) | German Shepherd |
| 15 |        12 |       Breed |                 (null) |       Labradors |

select id，parentid

表中的

parentid

在哪里？看一看它在哪里提到使用Oracle的“connect by”@GiorgiNakeuri我已经删除了查询，所以我没有confuse@GiorgiNakeuri我是否应该更改模式设计，以获得带有分层查询的json格式？我真的需要把这件事弄清楚。自从两天以来，我一直在努力解决这个问题。@user525146，我就是无法得到这些表之间的关系。例如，您是否可以忘记JSON，只需执行一个select即可返回所需的集合？表1是基本表，它有根节点，第二个表是下一级，第三个表是下一组子级。这有意义吗？