mysql - 如何从 child id中获取所有 parent

Question

我创建了一个名为“net”的表并像这样插入了值。

id      name            parent
--------------------------------------
    1   fruits          0
    2   Apple           1
    3   Orange          1
    4   Grape           2
    5   Green Apple     2
    6   Red Apple       4

我想要得到 child “6”的所有 parent 。请帮助我

我期望的结果，当过滤数据时，id=6，它将生成我期望的结果。

lv1         lv2             lv3
--------------------------------------
4             2               1

或者像这样

       id   name           parent
--------------------------------------
        4   Grape           2
        2   Apple           1
        1   fruits          0

Answer 1

你可以使用这个:

SELECT T2.id, T2.name, T2.parent
FROM (
    SELECT
        @r AS _id,
        (SELECT @r := parent FROM table1 WHERE id = _id) AS parent,
        @l := @l + 1 AS lvl
    FROM
        (SELECT @r := 6, @l := 0) vars,
        table1 h
    WHERE @r <> 0) T1
JOIN table1 T2
ON T1._id = T2.id 
where T2.id<>6
ORDER BY T1.lvl

SQL HERE