[해커랭크] Aggregation

문제링크 : https://www.hackerrank.com/challenges/earnings-of-employees/problem?isFullScreen=true

 

❓문제

We define an employee's total earnings to be their monthly  salray x 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.

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

Sample Output

69952 1

Explanation

The table and earnings data is depicted in the following diagram: 

The maximum earnings value is 69952. The only employee with earnings = 69952 is Kimberly, so we print the maximum earnings value (69952) and a count of the number of employees who have earned $69952 (which is 1) as two space-separated values.

 

🔉 문제 설명

 

소득 = 월급 x 월

모든 직원의 최대 총 소득과, 최대 총 소득이 있는 직원을 찾고 싶습니다.

이 값들을 2개의 공백으로 구분된 정수로 뽑아주세요.

 

❗답

SELECT salary * months as earning, COUNT(*)
FROM Employee
GROUP BY earning
ORDER BY earning DESC
LIMIT 1

 

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🤔풀이

 LIMIT 1을 하면 최상위 값만 추출한