mysql选择递归父id错误“where子句”中的未知列

我是初学者，我尝试实现一个基于父id的递归查询

我在一个旧答案中发现了一个很好的例子：

表格如下：

create table department (id int, name varchar(100), id_parent int null);
insert into department values (1, 'DEPARTMENT 1', NULL);
insert into department values (2, 'DEPARTMENT 2', 1);
insert into department values (3, 'DEPARTMENT 3', 2);
insert into department values (4, 'DEPARTMENT ABCD', 3);
insert into department values (5, 'DEPARTMENT X', NULL);
insert into department values (6, 'DEPARTMENT Y', 5);
insert into department values (7, 'DEPARTMENT Z', 6);
insert into department values (8, 'DEPARTMENT AB', 7);

以及查询：

SELECT D2.id, D2.name, D2.id_parent
FROM (
    SELECT
        @d AS _id,
        (SELECT @d := id_parent FROM department WHERE id = _id) AS id_parent,
        @l := @l + 1 AS level
    FROM
        (SELECT 
            @d := (select id from department where name like 'DEPARTMENT AB'), 
            @l := 0
        ) initial_level,
        department D
    WHERE @d <> 0
) D1
JOIN department D2 ON D1._id = D2.id
ORDER BY D1.level DESC;

我之所以选择该示例，是因为这里还有一个工作演示：

问题是： sqlfiddle在线运行良好，但如果我在PC中尝试过，会出现以下错误： “where子句”中的未知列“\u id”

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我使用mysql5.7.9在WAMP上运行，我用@d变量代替了id来解决它们

(SELECT @d := id_parent FROM department WHERE id = @d) AS id_parent