Easy and Simple
```\n# Write your MySQL query statement below\nselect employee_id from Employees where employee_id not in (select employee_id from salaries)\nunion \nselect emp
```\n# Write your MySQL query statement below\nselect employee_id from Employees where employee_id not in (select employee_id from salaries)\nunion \nselect employee_id from salaries where employee_id not in(select employee_id from employees)\norder by employee_id
['Union Find', 'MySQL']