php - 如何列出所有上线？

Question

我想选择“Apple”然后输出“John”和“Michelle”。 我尝试运行代码，但它不起作用。请帮忙。

select @start := title as 'title', id, parent
from mytable
join 
(select @start := 0) temp
where parent = @start and title = "Apple";

链接:http://sqlfiddle.com/#!9/91fd40/1/0

Answer 1

我自己找到了答案，以防万一有人需要Demo :

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