Super Easy solution.
Intuition\n\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- Tim
# Intuition\n![upvote.png](https://assets.leetcode.com/users/images/c61476a1-59e3-45e2-8cea-8b468e937cbb_1692039020.491576.png)\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 COALESCE(E.employee_id, S.employee_id) AS employee_id\nFROM Employees E\nFULL JOIN Salaries S ON E.employee_id = S.employee_id\nWHERE E.employee_id IS NULL OR S.employee_id IS NULL\nORDER BY employee_id;\n\n\n```
['MS SQL Server']