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목록Data Analysis/SQL (66)
혜온의 이것저것
https://www.hackerrank.com/challenges/placements/problem?isFullScreen=true Placements | HackerRank Write a query to output the names of those students whose best friends got offered a higher salary than them. www.hackerrank.com 문제 You are given three tables: Students, Friends and Packages. Students contains two columns: ID and Name. Friends contains two columns: ID and Friend_ID (ID of the ONLY ..
https://www.hackerrank.com/challenges/sql-projects/problem?isFullScreen=true SQL Project Planning | HackerRank Write a query to output the start and end dates of projects listed by the number of days it took to complete the project in ascending order. www.hackerrank.com 문제 You are given a table, Projects, containing three columns: Task_ID, Start_Date and End_Date. It is guaranteed that the diffe..
https://www.hackerrank.com/challenges/contest-leaderboard/problem?isFullScreen=true Contest Leaderboard | HackerRank Generate the contest leaderboard. www.hackerrank.com 문제 You did such a great job helping Julia with her last coding contest challenge that she wants you to work on this one, too! The total score of a hacker is the sum of their maximum scores for all of the challenges. Write a quer..
https://www.hackerrank.com/challenges/challenges/problem?isFullScreen=true Challenges | HackerRank Print the total number of challenges created by hackers. www.hackerrank.com 문제 Julia asked her students to create some coding challenges. Write a query to print the hacker_id, name, and the total number of challenges created by each student. Sort your results by the total number of challenges in de..
https://www.hackerrank.com/challenges/harry-potter-and-wands/problem?isFullScreen=true Ollivander's Inventory | HackerRank Help pick out Ron's new wand. www.hackerrank.com 문제 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-ev..