获取祖籍列表，包括自己

select GROUP_CONCAT(A.dept_id SEPARATOR  ',') as ancestors from (SELECT T2.dept_id, T2.dept_name
FROM ( 
    SELECT 
        @r AS _id, 
        (SELECT @r := parent_id FROM sys_dept WHERE dept_id = _id) AS parent_id, 
        @l := @l + 1 AS lvl 
    FROM 
        (SELECT @r := 173697, @l := 0) vars,  
        sys_dept h 
    WHERE @r <> 0) T1 
JOIN sys_dept T2 
ON T1._id = T2.dept_id 
ORDER BY T1.lvl DESC ) A;

获取祖籍列表，不包括自己

SELECT
	CONCAT(
		'0,',
	GROUP_CONCAT( A.parent_id SEPARATOR ',' )) as ancestors 
FROM
	(
	SELECT
		_id AS org_id,
		parent_id,
		lvl 
	FROM
		(
		SELECT
			@orgId AS _id,
			( SELECT @orgId := parent_id FROM sys_dept WHERE dept_id = _id ) AS parent_id,
			@l := @l + 1 AS lvl 
		FROM
			( SELECT @orgId :=230455 , @l := 0 ) vars,
			sys_dept h 
		WHERE
			@orgId IS NOT NULL 
		) T1 
	WHERE
		T1.parent_id IS NOT NULL 
		AND T1.parent_id != 0 
	ORDER BY
	lvl DESC 
	) A;