LeetCode 1468. Calculate Salaries

Description

https://leetcode.com/problems/calculate-salaries/

SQL Schema

Table Salaries:

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| company_id    | int     |
| employee_id   | int     |
| employee_name | varchar |
| salary        | int     |
+---------------+---------+
(company_id, employee_id) is the primary key for this table.
This table contains the company id, the id, the name and the salary for an employee.

Write an SQL query to find the salaries of the employees after applying taxes.

The tax rate is calculated for each company based on the following criteria:

  • 0% If the max salary of any employee in the company is less than 1000$.
  • 24% If the max salary of any employee in the company is in the range [1000, 10000] inclusive.
  • 49% If the max salary of any employee in the company is greater than 10000$.

Return the result table in any order. Round the salary to the nearest integer.

The query result format is in the following example:

Salaries table:
+------------+-------------+---------------+--------+
| company_id | employee_id | employee_name | salary |
+------------+-------------+---------------+--------+
| 1          | 1           | Tony          | 2000   |
| 1          | 2           | Pronub        | 21300  |
| 1          | 3           | Tyrrox        | 10800  |
| 2          | 1           | Pam           | 300    |
| 2          | 7           | Bassem        | 450    |
| 2          | 9           | Hermione      | 700    |
| 3          | 7           | Bocaben       | 100    |
| 3          | 2           | Ognjen        | 2200   |
| 3          | 13          | Nyancat       | 3300   |
| 3          | 15          | Morninngcat   | 7777   |
+------------+-------------+---------------+--------+

Result table:
+------------+-------------+---------------+--------+
| company_id | employee_id | employee_name | salary |
+------------+-------------+---------------+--------+
| 1          | 1           | Tony          | 1020   |
| 1          | 2           | Pronub        | 10863  |
| 1          | 3           | Tyrrox        | 5508   |
| 2          | 1           | Pam           | 300    |
| 2          | 7           | Bassem        | 450    |
| 2          | 9           | Hermione      | 700    |
| 3          | 7           | Bocaben       | 76     |
| 3          | 2           | Ognjen        | 1672   |
| 3          | 13          | Nyancat       | 2508   |
| 3          | 15          | Morninngcat   | 5911   |
+------------+-------------+---------------+--------+
For company 1, Max salary is 21300. Employees in company 1 have taxes = 49%
For company 2, Max salary is 700. Employees in company 2 have taxes = 0%
For company 3, Max salary is 7777. Employees in company 3 have taxes = 24%
The salary after taxes = salary - (taxes percentage / 100) * salary
For example, Salary for Morninngcat (3, 15) after taxes = 7777 - 7777 * (24 / 100) = 7777 - 1866.48 = 5910.52, which is rounded to 5911.

Explanation

Use a subquery to find out the max salary for each company. Then join with the original Salaries table by company_id. Having a IF() function to recalculate salary base on the max salary of the company.

SQL Solution

# Write your MySQL query statement below


select a.company_id, employee_id, employee_name, 

IF(max_salary > 10000, ROUND(salary * 0.51), IF(max_salary > 1000, ROUND(salary * 0.76), salary)) as salary 

from Salaries as a

join 

(select company_id, max(salary) as max_salary from Salaries group by company_id) as b

on a.company_id = b.company_id

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