pg树形查询

-- pg 树形查询，根据父id，查找子id
WITH RECURSIVE organization_tree AS (
    SELECT id, name, parent_id,company_id, 1 as level
    FROM hr_department
    WHERE company_id IS not NULL
    UNION ALL
    SELECT o.id, o.name, o.parent_id,o.company_id, ot.level + 1
    FROM hr_department o
    JOIN organization_tree ot ON o.parent_id = ot.id
)
SELECT id, name, parent_id,company_id, level
FROM organization_tree
ORDER BY level, id;

-- pg 树形查询，根据子id，查找所有的父id

WITH RECURSIVE organization_ancestors AS (
    SELECT id, parent_id,name,company_id
    FROM hr_department
    WHERE id = 3421  -- 替换为要查找的子节点的ID
    UNION ALL
    SELECT o.id, o.parent_id,o.name,o.company_id
    FROM hr_department o
    JOIN organization_ancestors oa ON o.id = oa.parent_id
)
SELECT company_id
FROM organization_ancestors where company_id is not null;