This Leetcode problem All People Report to the Given Manager LeetCode Solution is done in SQL.

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All People Report to the Given Manager LeetCode Solution

Problem Statement

employee_id is the primary key for this table.
Each row of this table indicates that the employee with ID employee_id and name employee_name reports his work to his/her direct manager with manager_id
The head of the company is the employee with employee_id = 1.

Write an SQL query to find employee_id of all employees that directly or indirectly report their work to the head of the company. The indirect relation between managers will not exceed 3 managers as the company is small. Return result table in any order without duplicates.

The result format is in the following example.

Example 1:
Input:

Output:

Explanation:
The head of the company is the employee with employee_id 1.
The employees with employee_id 2 and 77 report their work directly to the head of the company.
The employee with employee_id 4 report his work indirectly to the head of the company 4 –> 2 –> 1.
The employee with employee_id 7 report his work indirectly to the head of the company 7 –> 4 –> 2 –> 1.
The employees with employee_id 3, 8 and 9 don’t report their work to head of company directly or indirectly.

All People Report to the Given Manager LeetCode Solution MySQL

select 
  distinct e1.employee_id 
from 
  Employees as e1 
  inner join Employees as e2 
  inner join Employees as e3 on e1.manager_id = e2.employee_id 
  and e2.manager_id = e3.employee_id 
where 
  e1.employee_id <> 1 
  and (
    e1.manager_id = 1 
    or e2.manager_id = 1 
    or e3.manager_id = 1
  );Code language: SQL (Structured Query Language) (sql)