Formatted question description: https://leetcode.ca/all/1468.html

1468. Calculate Salaries

Level

Medium

Description

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   | 1866   |
+------------+-------------+---------------+--------+

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.

Solution

Use case-when statements. For each company_id, find the maximum salary and determine the tax rate, and calculate each employee’s salary after applying tax accordingly.

# Write your MySQL query statement below
select s.company_id, s.employee_id, s.employee_name, (
    round(case
        when (select max(t.salary) from Salaries t where t.company_id = s.company_id) < 1000 then s.salary
        when (select max(t.salary) from Salaries t where t.company_id = s.company_id) between 1000 and 10000 then s.salary * (1 - 0.24)
        else s.salary * (1 - 0.49)
        end, 0)
    ) as salary from Salaries s;

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