Simple MySQL solution using NOT IN
\n# Write your MySQL query statement below\nSELECT employee_id FROM Employees\nWHERE employee_id NOT IN (SELECT employee_id FROM Salaries)\nUNION SELECT employe
```\n# Write your MySQL query statement below\nSELECT employee_id FROM Employees\nWHERE employee_id NOT IN (SELECT employee_id FROM Salaries)\nUNION SELECT employee_id FROM Salaries\nWHERE employee_id NOT IN (SELECT employee_id FROM Employees)\nORDER BY employee_id;\n```
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