Write/execute a SQL statement that lists all twenty employee Ids, salaries, department ID in which they work, and their department's name. If an employee is not currently assigned to a department, he/she must still be on the list, with their department name just left blank.
From Departments table:
DEPARTMENT_ID, DEPARTMENT_NAME, MANAGER_ID, LOCATION_ID, DEPARTMENTS
From Employees table:
JOB_ID, EMPLOYEE_ID, COMMISSION_PCT, SALARY, EMAIL, FIRST_NAME, LAST_NAME, HIRE_DATE, PHONE_NUMBER, MANAGER_ID, DEPARTMENT_ID