Beginner friendly solution
\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
```\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 asc\n```
['MySQL']