一条不理解SQL语句,查询树

Question

SELECT a.org_id, a.org_name
FROM org a
WHERE a.org_parentid = 1
AND ((a.org_id in
(select org_id
from user_org
where user_id in (select user_.user_id
from user_, user_role, wf_step_role
where wf_step_role.role_id = user_role.role_id
and user_role.user_id = user_.user_id
and wf_step_role.step_id = 2))) OR
(SELECT COUNT(*)
FROM org b
WHERE b.org_id in
(select org_id
from user_org
where user_id in
(select user_.user_id
from user_, user_role, wf_step_role
where wf_step_role.role_id = user_role.role_id
and user_role.user_id = user_.user_id
and wf_step_role.step_id = 2))
and rownum < 2
START WITH b.org_id = a.org_id
CONNECT BY PRIOR b.org_id = b.org_parentid) > 0)
order by org_order

在OR后面的不是true就是False
请解释一下这条SQL意思，详细说明一下！

Answer 1

or是短路操作嘛

如果or的左边是true，那就不对右边进行查询了，
如果or的左边是false，才对右边进行查询，