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CREATE TABLE employee (ID, EMPID, NAME, manager) AS SELECT 1, 'EM1', 'ana', 'EM3' FROM DUAL UNION ALL SELECT 2, 'EM2', 'john', NULL FROM DUAL UNION ALL SELECT 3, 'EM3', 'ravi', 'EM2' FROM DUAL UNION ALL SELECT 4, 'EM4', 'das', 'EM2' FROM DUAL UNION ALL SELECT 5, 'EM5', 'michael', 'EM3' FROM DUAL;
5 rows affected
select manager, count(empid) as count, listagg(empid, ',' ) within group (order by empid) as employees from employee where (manager is not null) group by manager order by manager;
MANAGER
COUNT
EMPLOYEES
EM2
2
EM3,EM4
EM3
2
EM1,EM5