SOLUTION WITH SIMPLE QUERY FULL JOIN( SQL SERVER )
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n/* Write your T-SQL query statement below */\n\nSELECT\n    ISNULL(E.employee_id,s.employee_id) employee_id\nFROM\n    Employees E\nFULL JOIN \n    Salaries S ON E.employee_id = S.employee_id\nWHERE\n    E.name IS NULL\nOR\n    S.salary IS NULL\nORDER BY\n     ISNULL(E.employee_id,s.employee_id)\n```
['MS SQL Server']