仅根据id和parent_id 查询部门及其所有子部门

SELECT
	id 
FROM
	(
	SELECT
		t1.id,
	IF
		( find_in_set( parent_id, @pids ) > 0, @pids := concat( @pids, ',', id ), 0 ) AS ischild 
	FROM
		( SELECT id, parent_id FROM base_authority_organization t ORDER BY parent_id, id ) t1,
		( SELECT @pids := '3209HZB' ) t2 
	) t3 
WHERE
	ischild != 0;

仅根据id和parent_id