Write a query to display manager and employees under them?

select manager,count(employee),
rtrim(xmlagg(xmlelement(e,employee||’,’)).extract(‘//text()’),’,’) as “Employees under the Manager”
from (select e2.first_name manager,e1.first_name employee
from employee e1,employee e2
where e1.reporting_to=e2.employeeid)
group by manager;

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