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IshaSQL

Foundations Track · Easy · 15 min

Employees Whose Manager Left the Company

Table: Employees +-------------+----------+ | Column Name | Type | +-------------+----------+ | employee_id | int | | name | varchar | | manager_id | int | |...

Foundations Track
Easy
15 min
filtering

Company labels are directional practice context, not official interview guidance.

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Objective

Practice filtering through a IshaSQL-tagged business scenario.

Approach

Use this track to lock in clean query structure, basic filtering logic, and confidence with grouped output.

Company context

Company labels are directional practice context, not official interview guidance.

Prereq: query basics

Table: Employees +-------------+----------+ | Column Name | Type | +-------------+----------+ | employee_id | int | | name | varchar | | manager_id | int | | salary | int | +-------------+----------+ In SQL, 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). Find 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 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.

Employees
employee_id INT PRIMARY KEY
name VARCHAR(50
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