mysql根据某层部门ID查询所有下级多层子部门

SELECT dept_id, simple_name FROM
(
SELECT t1.dept_id, t1.simple_name, IF(FIND_IN_SET(pid, @pids) > 0, @pids := CONCAT(@pids, ',', dept_id), 0) AS ischild
FROM
(SELECT dept_id, pid, simple_name FROM sys_dept t ORDER BY pid, dept_id) t1,
(SELECT @pids := 1303172963761045505) t2
)
t3
WHERE ischild != 0

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PS：还是没有完全看懂，自测通过，先用着再说；

参考链接：

https://blog.csdn.net/Scoful/article/details/106441476

=》Mysql根据某层部门ID查询所有下级多层子部门