Find the number of employees in each department using SQL

Write a method to find the number of employees in each department.

My initial thoughts(code):

SELECT Department.DepartmentName, COUNT(employee.lastName)
FROM employee, department 
WHERE employee.DepartmentID = department.DepartmentID
GROUP BY Department.DepartmentName

Solution:
SELECT Dept_Name, Departments.Dept_ID, COUNT(*) AS 'num_employees'
FROM Departments
LEFT JOIN Employees
ON Employees.Dept_ID = Departments.Dept_ID
GROUP BY Departments.Dept_ID, Dept_Name

					

			

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