Query to find the no. of related no. of Items with a item.

Hi,
I made some items in inventory. I have to find the no. of child items that are connected to a parent item. Like if there is a parent item a and it has two sub item b1 and b2. again b1 has two subitem b11, b12. similar b2 have two subitem b21, b22. and this goes on. So i have to make a query to find out all the the items.
Plz give me the solutions.
Regards
user609981

Dou you know read?
-- the number of rows in a table named yourtable:
select count(1) from yourtable;
-- the number of columns in a table
-- If is a user's table:
select count(1)
from user_tab_columns
where table_name='YOURTABLE'
--If it is´t
select count(1)
from DBA_tab_columns
where owner = 'USEROWNER'
and table_name='YOURTABLE'

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