Formatted question description: https://leetcode.ca/all/1978.html

1978. Employees Whose Manager Left the Company

Level

Easy

Description

Table: Employees

+-------------+----------+
| Column Name | Type     |
+-------------+----------+
| employee_id | int      |
| name        | varchar  |
| manager_id  | int      |
| salary      | int      |
+-------------+----------+
employee_id is the primary key for this table.
This table contains information about the employees, their salary, and the ID of their manager. Some employees do not have a manager (manager_id is null). 

Write an SQL query to report the IDs of the employees whose salary is strictly less than $30000 and whose manager left the company. When a manager leaves the company, their information is deleted from the Employees table, but the reports still have their manager_id` set to the manager that left.

Return the result table ordered by employee_id.

The query result format is in the following example.

Example 1:

Input:  
Employees table:
+-------------+-----------+------------+--------+
| employee_id | name      | manager_id | salary |
+-------------+-----------+------------+--------+
| 3           | Mila      | 9          | 60301  |
| 12          | Antonella | null       | 31000  |
| 13          | Emery     | null       | 67084  |
| 1           | Kalel     | 11         | 21241  |
| 9           | Mikaela   | null       | 50937  |
| 11          | Joziah    | 6          | 28485  |
+-------------+-----------+------------+--------+
Output: 
+-------------+
| employee_id |
+-------------+
| 11          |
+-------------+

Explanation: 
The employees with a salary less than $30000 are 1 (Kalel) and 11 (Joziah).
Kalel's manager is employee 11, who is still in the company (Joziah).
Joziah's manager is employee 6, who left the company because there is no row for employee 6 as it was deleted.

Solution

Select the entries with salary < 30000 and manager_id do not appear as a value of employee_id. Keep the values employee_id for these entries and order by employee_id.

# Write your MySQL query statement below
select employee_id from Employees
    where salary < 30000
    and manager_id not in (
        select employee_id from Employees
    )
    order by employee_id;

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