LeetCode 1978: Employees Whose Manager Left the Company Solution
Master LeetCode problem 1978 (Employees Whose Manager Left the Company), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1978. Employees Whose Manager Left the Company
Problem Explanation
Explanation:
To solve this problem, we need to find employees whose salary is less than $30,000 and whose manager has left the company. This can be achieved by joining the Employees table with itself on the manager_id column and then filtering the rows based on the given conditions.
- Join the Employees table with itself on the manager_id column to find employees and their managers.
- Filter the joined table to select employees whose salary is less than $30,000 and whose manager has left the company (manager_id is null in the joined table).
- Return the employee_id of the filtered employees in ascending order.
Time Complexity: O(n) Space Complexity: O(n)
:
Solution Code
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