[HackerRank] Top Earners 풀이 (mySQL)

문제

 

We define an employee's total earnings to be their monthly (salary * months) worked, and the maximum total earnings to be the maximum total earnings for any employee in the Employee table.

Write a query to find the maximum total earnings for all employees as well as the total number of employees who have maximum total earnings. Then print these values as  2 space-separated integers.

👉 총 급여 최댓값과 해당 급여를 받은 직원 수를 출력할 것

 

Input Format

The Employee table containing employee data for a company is described as follows:

where employee_id is an employee's ID number, name is their name, months is the total number of months they've been working for the company, and salary is the their monthly salary.

Sample Input

 

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풀이

 

• 먼저 총급여를 계산해야 한다 : SELECT 절에 months * salary를 곱하여 earnings를 만든다.
• 원하는 값은 earnings의 최댓값이므로, order by earnings desc를 고려한다.
• 이때, 최대 총 급여를 받는 직원 수를 계산하기 위해 group by earnings를 한 다음, count() 해준다.

SELECT MONTHS * SALARY as earnings, COUNT(*)
FROM EMPLOYEE
GROUP BY earnings
ORDER BY earnings DESC
LIMIT 1;