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Top Competitors | HackerRank Query a list of top-scoring hackers. www.hackerrank.com Problem Julia just finished conducting a coding contest, and she needs your help assembling the leaderboard! Write a query to print the respective hacker_id and name of hackers who achieved full scores for more than one challenge. Order your output in descending order by the total number of challenges in which t..
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Population Census | HackerRank Query the sum of the populations of all cities on the continent 'Asia'. www.hackerrank.com Problem Given the CITY and COUNTRY tables, query the sum of the populations of all cities where the CONTINENT is 'Asia'. -> 아시아에 있는 모든 도시의 인구 수의 합을 출력하시오. Answer select sum(a.population) from city a inner join country b on a.countrycode = b.code where b.continent = "Asia"
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Ollivander's Inventory | HackerRank Help pick out Ron's new wand. www.hackerrank.com Problem Harry Potter and his friends are at Ollivander's with Ron, finally replacing Charlie's old broken wand. Hermione decides the best way to choose is by determining the minimum number of gold galleons needed to buy each non-evil wand of high power and age. Write a query to print the id, age, coins_needed, a..
