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목록그룹바이 (2)
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[SQL : HackerRank] Population Density Difference , Weather Observation Station 11, Weather Observation Station 13
1] Population Density Difference >> 문제 Query the difference between the maximum and minimum populations in CITY. Input Format The CITY table is described as follows: >> 문제 푼 코드 select max(population) - min(population) from city www.hackerrank.com/challenges/population-density-difference/problem Population Density Difference | HackerRank Query the difference between the maximum and minimum city p..
[SQL : GROUP BY/ where 서브쿼리 ] HackerRank: Top Earners
Top Earners >> 문제 We define an employee's total earnings to be their monthly salary 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 space-separated integers...