SELECT * FROM (SELECT * from tb_dept ORDER BY id desc LIMIT 100000) a GROUP BY parent_id order by id;
// 注： 不加 limit 可能会导致结果不正确>

SELECT b.*
  from douyin_fans b join(
SELECT max(md_id)  maxId
  FROM douyin_fans
 where time>= ‘.strtotime("-30 day").‘
 GROUP BY member_id)  mf on mf.maxId= b.md_id
 order by b.total_fans desc
 limit ‘.input(‘ limit/d ‘,0).‘,
       30 ‘