[MySQL] Union Table Solution | Easy Solution |
\nSELECT emp.employee_id\nFROM\n    (SELECT \n        salaries.employee_id\n     FROM\n        employees RIGHT JOIN salaries\n        ON employees.employee_id =
```\nSELECT emp.employee_id\nFROM\n    (SELECT \n        salaries.employee_id\n     FROM\n        employees RIGHT JOIN salaries\n        ON employees.employee_id = salaries.employee_id\n     WHERE\n        employees.name IS NULL\n\n    UNION\n\n     SELECT \n        employees.employee_id\n     FROM\n        employees LEFT JOIN salaries\n        ON employees.employee_id = salaries.employee_id\n     WHERE\n        salaries.salary IS NULL\n    ) AS emp\nORDER BY emp.employee_id\n```
['Union Find', 'MySQL']