Leetcode SQL: managers with 5 reports - explained

Publié le: 06 juillet 2024
sur la chaîne: Analyst's Corner

From Leetcode:

Explanation and opinion on Leetcode's Manager with 5 Direct Reports question.

Write a solution to find managers with at least five direct reports.
Return the result table in any order.
The result format is in the following example.

Table: Employee

+-------------+---------+
| Column Name | Type |
+-------------+---------+
| id | int |
| name | varchar |
| department | varchar |
| managerId | int |
+-------------+---------+
id is the primary key (column with unique values) for this table.
Each row of this table indicates the name of an employee, their department, and the id of their manager.
If managerId is null, then the employee does not have a manager.
No employee will be the manager of themself.

This SQL query identifies managers who supervise at least five employees by:

Creating a temporary table of managers and their employees.
Filtering to keep only those managers with five or more employees.
Selecting and displaying the names of these managers.

By understanding this query, you can learn how SQL can be used to manage and analyze employee data in a database efficiently. This knowledge is foundational for database management and can be a valuable skill in many tech-related fields.

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