创建函数：
create or replace FUNCTION F_jishubu(userid IN VARCHAR2)
RETURN number is
v_result number;
BEGIN
select count(*) amount
into v_result
from user_info
where user_id=userid
and org_id in (SELECT org_id FROM org_info
START WITH org_id = '11010760' CONNECT BY PRIOR org_id = parent_org_id);
RETURN v_result;
END F_jishubu;
如果有判断：
if 条件 then
执行语句
else
执行语句
end if;