Radosław WalczakHackerRank SQL: Top CompetitorsJulia just finished conducting a coding contest, and she needs your help assembling the leaderboard! Write a query to print the respective…Apr 13Apr 13
Radosław WalczakHackerRank SQL: Binary Tree NodesYou are given a table, BST, containing two columns: N and P, where N represents the value of a node in Binary Tree, and P is the parent of…Mar 19Mar 19
Radosław WalczakHackerRank SQL: OccupationsPivot the Occupation column in OCCUPATIONS so that each Name is sorted alphabetically and displayed underneath its corresponding…Feb 15Feb 15
Radosław WalczakHackerRank SQL: New CompaniesAmber’s conglomerate corporation just acquired some new companies. Each of the companies follows this hierarchy:Feb 14Feb 14
Radosław WalczakHackerRank SQL: Ollivander’s InventoryVery Fun Task! I would love to see more use that kind of theme!Feb 10Feb 10
Radosław WalczakHackerRank: The ReportYou are given two tables: Students and Grades. Students contains three columns ID, Name and Marks.Feb 10Feb 10
Radosław WalczakHackerRank SQL: ChallengesJulia asked her students to create some coding challenges. Write a query to print the hacker_id, name, and the total number of challenges…Feb 10Feb 10