Fast solution || using Not in and Union and Order by employee_id
\n\n# Code\n\n# Write your MySQL query statement below\n\nselect employee_id from salaries where employee_id not in \n(select employee_id from employees)\nunion
\n\n# Code\n```\n# Write your MySQL query statement below\n\nselect employee_id from salaries where employee_id not in \n(select employee_id from employees)\nunion\nselect employee_id from employees where employee_id not in \n(select employee_id from salaries)\norder by employee_id\n\n```
['MySQL']