我有这个4级用户表,如下所示
user_id parent_id
1 NULL
2 1
3 2
4 2
5 3
6 1
我想选择某个父ID下的所有用户,例如user_id = 1,在这种情况下应返回如下结果:
user_id parent_id
2 1 // return because parent_id = 1
6 1 // return because parent_id = 1
3 2 // return because parent_id of 2 is 1
4 2 // return because parent_id of 2 is 1
5 3 // return because parent_id of 3 is 2
通过提供ID,查询是什么?
提前致谢!
答案 0 :(得分:0)
试试这个::
Select
user_id
from
my_table
where parent_id in
(
Select
user_id
from my_table where parent_id in
(Select user_id from my_table where parent_id in(Select user_id from my_table where parent_id =?)))
答案 1 :(得分:0)
parentid as refid
Select userid from SampleTree where refid = 0 or refid in (Select userid from SampleTree where refid =0
or refid in (Select userid from SampleTree where refid =0 or
refid in (Select userid from SampleTree where refid =0)))