What is the code of each role and the number of employees in each role?
SELECT role_code ,  count(*) FROM Employees GROUP BY role_code
SELECT role_code ,  count(*) FROM Employees GROUP BY role_code
[{'Role_Code': 'ED', 'count(*)': 7}, {'Role_Code': 'HR', 'count(*)': 1}, {'Role_Code': 'MG', 'count(*)': 1}, {'Role_Code': 'PR', 'count(*)': 5}, {'Role_Code': 'PT', 'count(*)': 1}]