MySQL || Simple Query || Using Union
\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 i
```\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) order by employee_id;\n```
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