Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.
Awesome Lists | Featured Topics | Projects
https://github.com/mostafanabieh/58-challenges-solved-by-sql

The solutions of all SQL hackerrank challenges using MySQL
https://github.com/mostafanabieh/58-challenges-solved-by-sql
challenge hackerrank hackerrank-solutions hackerrank-sql hackerrank-sql-solutions mysql mysql-database sql
Last synced: 1 day ago
JSON representation
The solutions of all SQL hackerrank challenges using MySQL
Host: GitHub
URL: https://github.com/mostafanabieh/58-challenges-solved-by-sql
Owner: MostafaNabieh
Created: 2021-01-25T16:24:07.000Z (about 4 years ago)
Default Branch: main
Last Pushed: 2021-01-26T03:22:39.000Z (about 4 years ago)
Last Synced: 2025-01-08T13:57:24.433Z (19 days ago)
Topics: challenge, hackerrank, hackerrank-solutions, hackerrank-sql, hackerrank-sql-solutions, mysql, mysql-database, sql
Homepage:
Size: 85.9 KB
Stars: 5
Watchers: 2
Forks: 2
Open Issues: 0
Metadata Files:
- Readme: README.md
Awesome Lists containing this project

README

        # 58 Challenges Solved by SQL 

![maxresdefault](https://user-images.githubusercontent.com/46414243/105733970-c9019c80-5f3a-11eb-8138-e093ea834718.jpg)

## Description

**The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL**

## Domains

### Basic Select Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [Revising the Select Query I](https://www.hackerrank.com/challenges/revising-the-select-query/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Revising%20the%20Select%20Query%20I.sql)  |

| 2 | [Revising the Select Query II](https://www.hackerrank.com/challenges/revising-the-select-query-2/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Revising%20the%20Select%20Query%20II.sql)  |

| 3 | [Select All](https://www.hackerrank.com/challenges/select-all-sql/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Select%20All.sql)  |

| 4 | [Select By ID](https://www.hackerrank.com/challenges/select-by-id/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Select%20By%20ID.sql)  |

| 5 | [Japanese Cities' Attributes](https://www.hackerrank.com/challenges/japanese-cities-attributes/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Japanese%20Cities'%20Attributes.sql)  |

| 6 | [Japanese Cities' Names](https://www.hackerrank.com/challenges/japanese-cities-name/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Japanese%20Cities'%20Names.sql)  |

| 7 | [Weather Observation Station 1](https://www.hackerrank.com/challenges/weather-observation-station-1/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%201.sql)  |

| 8 | [Weather Observation Station 3](https://www.hackerrank.com/challenges/weather-observation-station-3/submissions/code/197145959) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%203.sql)  |

| 9 | [Weather Observation Station 4](https://www.hackerrank.com/challenges/weather-observation-station-4/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%204.sql)  |

| 10 | [Weather Observation Station 5](https://www.hackerrank.com/challenges/weather-observation-station-5/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%205.sql)  |

| 11 | [Weather Observation Station 6](https://www.hackerrank.com/challenges/weather-observation-station-6/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%206.sql)  |

| 12 | [Weather Observation Station 7](https://www.hackerrank.com/challenges/weather-observation-station-7/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%207.sql)  |

| 13 | [Weather Observation Station 8](https://www.hackerrank.com/challenges/weather-observation-station-8/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%208.sql)  |

| 14 | [Weather Observation Station 9](https://www.hackerrank.com/challenges/weather-observation-station-9/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%209.sql)  |

| 15 | [Weather Observation Station 10](https://www.hackerrank.com/challenges/weather-observation-station-10/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2010.sql)  |

| 16 | [Weather Observation Station 11](https://www.hackerrank.com/challenges/weather-observation-station-11/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2011.sql)  |

| 17 | [Weather Observation Station 12](https://www.hackerrank.com/challenges/weather-observation-station-12/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2012.sql)  |

| 18 | [Higher Than 75 Marks](https://www.hackerrank.com/challenges/more-than-75-marks/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Higher%20Than%2075%20Marks.sql)  |

| 19 | [Employee Names](https://www.hackerrank.com/challenges/name-of-employees/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Employee%20Names.sql)  |

| 20 | [Employee Salaries](https://www.hackerrank.com/challenges/salary-of-employees/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Employee%20Salaries.sql)  |

### Advanced Select Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [Type of Triangle](https://www.hackerrank.com/challenges/what-type-of-triangle/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Select%20Challenges/Type%20of%20Triangle.sql)  |

| 2 | [The PADS](https://www.hackerrank.com/challenges/the-pads/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Select%20Challenges/The%20PADS.sql)  |

| 3 | [Occupations](https://www.hackerrank.com/challenges/occupations/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Select%20Challenges/Occupations.sql)  |

| 4 | [Binary Tree Nodes](https://www.hackerrank.com/challenges/binary-search-tree-1/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Select%20Challenges/Binary%20Tree%20Nodes.sql)  |

| 5 | [New Companies](https://www.hackerrank.com/challenges/the-company/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Select%20Challenges/New%20Companies.sql)  |

### Aggregation Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [Revising Aggregations - The Count Function](https://www.hackerrank.com/challenges/revising-aggregations-the-count-function/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Revising%20Aggregations%20-%20The%20Count%20Function.sql)  |

| 2 | [Revising Aggregations - The Sum Function](https://www.hackerrank.com/challenges/revising-aggregations-sum/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Revising%20Aggregations%20-%20The%20Sum%20Function.sql)  |

| 3 | [Revising Aggregations - Averages](https://www.hackerrank.com/challenges/revising-aggregations-the-average-function/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Revising%20Aggregations%20-%20Averages.sql)  |

| 4 | [Average Population](https://www.hackerrank.com/challenges/average-population/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Average%20Population.sql)  |

| 5 | [Japan Population](https://www.hackerrank.com/challenges/japan-population/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Japan%20Population.sql)  |

| 6 | [Population Density Difference](https://www.hackerrank.com/challenges/population-density-difference/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Population%20Density%20Difference.sql)  |

| 7 | [The Blunder](https://www.hackerrank.com/challenges/the-blunder/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/The%20Blunder.sql)  |

| 8 | [Top Earners](https://www.hackerrank.com/challenges/earnings-of-employees/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Top%20Earners.sql)  |

| 9 | [Weather Observation Station 2](https://www.hackerrank.com/challenges/weather-observation-station-2/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Weather%20Observation%20Station%202.sql)  |

| 10 | [Weather Observation Station 13](https://www.hackerrank.com/challenges/weather-observation-station-13/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2013.sql)  |

| 11 | [Weather Observation Station 14](https://www.hackerrank.com/challenges/weather-observation-station-14/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2014.sql)  |

| 12 | [Weather Observation Station 15](https://www.hackerrank.com/challenges/weather-observation-station-15/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2015.sql)  |

| 13 | [Weather Observation Station 16](https://www.hackerrank.com/challenges/weather-observation-station-16/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2016.sql)  |

| 14 | [Weather Observation Station 17](https://www.hackerrank.com/challenges/weather-observation-station-17/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2017.sql)  |

| 15 | [Weather Observation Station 18](https://www.hackerrank.com/challenges/weather-observation-station-18/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2018.sql)  |

| 16 | [Weather Observation Station 19](https://www.hackerrank.com/challenges/weather-observation-station-19/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Aggregation/Weather%20Observation%20Station%2019.sql)  |

| 17 | [Weather Observation Station 20](https://www.hackerrank.com/challenges/weather-observation-station-20/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Select/Weather%20Observation%20Station%2020.sql)  |

### Basic Join Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [Asian Population](https://www.hackerrank.com/challenges/asian-population/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Asian%20Population.sql)  |

| 2 | [African Cities](https://www.hackerrank.com/challenges/african-cities/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/African%20Cities.sql)  |

| 3 | [Average Population of Each Continent](https://www.hackerrank.com/challenges/average-population-of-each-continent/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Average%20Population%20of%20Each%20Continent.sql)  |

| 4 | [The Report](https://www.hackerrank.com/challenges/the-report/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/The%20Report.sql)  |

| 5 | [Top Competitors](https://www.hackerrank.com/challenges/full-score/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Top%20Competitors.sql)  |

| 6 | [Ollivander's Inventory](https://www.hackerrank.com/challenges/harry-potter-and-wands/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Ollivander's%20Inventory.sql)  |

| 7 | [Challenges](https://www.hackerrank.com/challenges/challenges/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Challenges.sql)  |

| 8 | [Contest Leaderboard](https://www.hackerrank.com/challenges/contest-leaderboard/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Basic%20Join/Contest%20Leaderboard.sql)  |

### Advanced Join Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [SQL Project Planning](https://www.hackerrank.com/challenges/sql-projects/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Join/SQL%20Project%20Planning.sql)  |

| 2 | [Placements](https://www.hackerrank.com/challenges/placements/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Join/Placements.sql)  |

| 3 | [Symmetric Pairs](https://www.hackerrank.com/challenges/symmetric-pairs/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Join/Symmetric%20Pairs.sql)  |

| 4 | [Interviews](https://www.hackerrank.com/challenges/interviews/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Join/Interviews.sql)  |

| 5 | [15 Days of Learning SQL](https://www.hackerrank.com/challenges/15-days-of-learning-sql/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Advanced%20Join/15%20Days%20of%20Learning%20SQL.sql)  |

### Alternative Queries Challenges

| Number | Challenges | Solutions | 

| ------------- | ------------- | -------------|

| 1 | [Draw The Triangle 1](https://www.hackerrank.com/challenges/draw-the-triangle-1/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Alternative%20Queries/Draw%20The%20Triangle%201.sql)  |

| 2 | [Draw The Triangle 2](https://www.hackerrank.com/challenges/draw-the-triangle-2/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Alternative%20Queries/Draw%20The%20Triangle%202.sql)  |

| 3 | [Print Prime Numbers](https://www.hackerrank.com/challenges/print-prime-numbers/problem) | [SQL](https://github.com/MostafaNabieh/58-challenges-solved-by-SQL/blob/main/Alternative%20Queries/Print%20Prime%20Numbers.sql)  |

## References 

1- https://www.w3schools.com/sql/

2- https://www.tutorialspoint.com/sql/index.htm