Well-structured HackerRank SQL Problem Solutions Table of Contents S.No Title Difficulty 1 Revising the Select Query I 2 Revising the Select Query II 3 Select All 4 Select By ID 5 Japanese Cities' Attributes 6 Japanese Cities' Names 7 Weather Observation Station 1 8 Weather Observation Station 3 9 Weather Observation Station 4 10 Weather Observation Station 5 11 Weather Observation Station 6 12 Weather Observation Station 7 13 Weather Observation Station 8 14 Weather Observation Station 9 15 Weather Observation Station 10 16 Weather Observation Station 11 17 Weather Observation Station 12 18 Higher Than 75 Marks 19 Employee Names 20 Employee Salaries 21 Type of Triangle 22 The PADS 23 Occupations 24 Binary Tree Nodes 25 New Companies 26 Revising Aggregations - The Count Function 27 Revising Aggregations - The Sum Function 28 Revising Aggregations - Averages 29 Average Population 30 Japan Population 31 Population Density Difference 32 The Blunder 33 Top Earners 34 Weather Observation Station 2 35 Weather Observation Station 13 36 Weather Observation Station 14 37 Weather Observation Station 15 38 Weather Observation Station 16 39 Weather Observation Station 17 40 Weather Observation Station 18 41 Weather Observation Station 19 42 Weather Observation Station 20 43 Asian Population 44 African Cities 45 Average Population of Each Continent 46 The Report 47 Top Competitors 48 Ollivander's Inventory 49 Challenges 50 Contest Leaderboard 51 SQL Project Planning 52 Placements 53 Symmetric Pairs 54 Interviews 55 15 Days of Learning SQL 56 Draw The Triangle 1 57 Draw The Triangle 2 58 Print Prime Numbers MIT License Copyright (c) 2025 Anuj Singh
