递归 JOIN

递归连接通常用于获取父子数据。在 SQL 中，它们使用递归公用表表达式实现 ，例如：

WITH RECURSIVE MyDescendants AS (
    SELECT Name
    FROM People
    WHERE Name = 'John Doe'

    UNION ALL

    SELECT People.Name
    FROM People
    JOIN MyDescendants ON People.Name = MyDescendants.Parent
)
SELECT * FROM MyDescendants;