Hierarchy count of emp table by job title

Question

Consider Emp table.
I want the hierarchical count by job title wise.
For president the count should be the total number of subordinates, i.e. the total number of emp's - 1 (the 1 is the president himself).
Like that any manager, the count is the total number of subordinates.
The output should be look like this:
Job Subordinates
President xx
Manager xx

Answer 1

I'm not sure what version you are looking into, but hierarchical total example is in 10g documentation (SQL Reference):
<quote>The following example uses a GROUP BY clause to return the total salary of each employee in department 110 and all employees below that employee in the hierarchy:
SELECT name, SUM(salary) "Total_Salary" FROM (
SELECT CONNECT_BY_ROOT last_name as name, Salary
FROM employees
WHERE department_id = 110
CONNECT BY PRIOR employee_id = manager_id)
GROUP BY name;
NAME Total_Salary
Gietz 8300
Higgins 20300
King 20300
Kochhar 20300
</quote>