using UNION And LEFT JOIN |EASY
\n\'\'\'\n\n# Write your MySQL query statement below\nSELECT Salaries.employee_id\nFROM Salaries \nLEFT JOIN Employees \n     on Employees.employee_id=Salaries.
\n\'\'\'\n\n# Write your MySQL query statement below\nSELECT Salaries.employee_id\nFROM Salaries \nLEFT JOIN Employees \n     on Employees.employee_id=Salaries.employee_id\nWHERE Employees.name is null\n\nunion\n\nSELECT Employees.employee_id\nFROM  Employees\nLEFT JOIN Salaries\n     on Salaries.employee_id=Employees.employee_id\nWHERE Salaries.salary is null\n\norder by employee_id\n\n    \n    \n\t\n\'\'\'
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