使用递归为 INSERT 生成行

Question

我需要使用递归将数据插入新表

person_department

。

我现在的桌子：

person
id      group_id
800    10
805    21


department
id     name     group_id      parent_id
1      ABC          10             5
2      TY           11             5
5      OOO         null            9
6      BN           21             9
9      AA          null            10
10     WEB         null           null

所以新表应该填写如下：

person_id    department_id
800                 1
800                 5
800                 9
800                10
805                 6
805                 9
805                10

对于每个人，我需要设置相应的部门及其所有家长。

我试过这个：

WITH RECURSIVE department_hierarchy AS (
    SELECT d.id AS department_id, d.parent_id
    FROM department d
    JOIN person p ON d.group_id = p.group_id
    
    UNION ALL
    
    SELECT d.id AS department_id, d.parent_id
    FROM department d
    JOIN department_hierarchy dh ON d.id = dh.parent_id
)
INSERT INTO person_department (person_id, department_id)
SELECT p.id AS person_id, dh.department_id
FROM person p
JOIN department_hierarchy dh ON dh.parent_id IS NULL OR dh.department_id IN (
    SELECT department_id FROM department_hierarchy
);

但它无法正常工作。

Answer 1

WITH RECURSIVE
  department_hierarchy AS
(
    SELECT
      p.id    AS person_id, 
      d.id    AS department_id
    FROM
      person       AS p
    INNER JOIN
      department   AS d
        ON d.group_id = p.group_id
    
    UNION ALL
    
    SELECT
      p.person_id, 
      d.parent_id
    FROM
      department_hierarchy   AS p
    INNER JOIN
      department             AS d
        ON d.id = p.department_id
    WHERE
      d.parent_id IS NOT NULL
)
INSERT INTO
  person_department (
    person_id,
    department_id
  )
SELECT
  *
FROM
  department_hierarchy