https://github.com/tawfikhammad/sql-problems-hackerrank

The solutions of SQL hackerrank problems
https://github.com/tawfikhammad/sql-problems-hackerrank

database hackerrank mysql sql

Last synced: 7 months ago
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The solutions of SQL hackerrank problems

• Host: GitHub
• URL: https://github.com/tawfikhammad/sql-problems-hackerrank
• Owner: tawfikhammad
• License: mit
• Created: 2024-02-12T15:45:48.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-04-13T15:44:10.000Z (almost 2 years ago)
• Last Synced: 2025-02-28T22:07:01.082Z (11 months ago)
• Topics: database, hackerrank, mysql, sql
• Language: TSQL
• Homepage: https://www.hackerrank.com/domains/sql
• Size: 1.38 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
# SQL Problems of Hackerrank

The solutions of SQL hackerrank problems 

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---

#### *If you find this repository helpful, consider giving it a star!*

## License

This repository is licensed under MIT License - see [License](LICENSE) for more details

## EASY 

| Title |

| :---: | 

| [Draw The Triangle 1](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Alternative%20Queries/Draw%20The%20Triangle%201) | 

| [Draw The Triangle 2](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Alternative%20Queries/Draw%20The%20Triangle%202) | 

| [Revising the Select Query I](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Revising%20the%20Select%20Query%20I) | 

| [Revising the Select Query II](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Revising%20the%20Select%20Query%20II)  | 

| [Select All](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Select%20All)  | 

| [Select by ID](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Select%20by%20ID) | 

| [Japanese Cities' Detail](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Japanese%20Cities'%20Detail)  | 

| [Japanese Cities' Name](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Japanese%20Cities'%20Name)  | 

| [Weather Observation Station 1](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%201)  |

| [Weather Observation Station 3](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%203)  | 

| [Weather Observation Station 4](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%204)  |

| [Weather Observation Station 5](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%205) |

| [Weather Observation Station 6](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%206)  |

| [Weather Observation Station 7](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%207)  | 

| [Weather Observation Station 8](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%208)  |

| [Weather Observation Station 9](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%209)  |

| [Weather Observation Station 10](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%2010)  | 

| [Weather Observation Station 11](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%2011)  |

| [Weather Observation Station 12](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Weather%20Observation%20Station%2012)  | 

| [Higher Than 75 marks](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Higher%20Than%2075%20marks)| 

| [Employee Names](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Employee%20Names) | 

| [Employee Salaries](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Select/Employee%20Salaries) | 

| [Type of Triangle](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Selection/Type%20of%20Triangle) | 

| [Revising Aggregations - The Count Function](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Revising%20Aggregations%20-%20The%20Count%20Function) | 

| [Revising Aggregations - The sum Function](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Revising%20Aggregations%20-%20The%20sum%20Function) | 

| [Revising Aggregations - Averages](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Revising%20Aggregations%20-%20Averages) | 

| [Average Population](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Average%20Population) |

| [Japan Population](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Japan%20Population) |

| [Population Density Difference](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Population%20Density%20Difference) |

| [The Blunder](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/The%20Blunder) |

| [Top Earners](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Top%20Earners) |

| [Weather Observation Station 2](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%202)  |

| [Weather Observation Station 13](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2013)  |

| [Weather Observation Station 14](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2014)  |

| [Weather Observation Station 15](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2015)  |

| [Weather Observation Station 16](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2016)  |

| [Weather Observation Station 17](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2017)  |

| [Population Census](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Population%20Census) |

| [African Cities](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/African%20Cities) |

| [Average Population of Each Continent](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Average%20Population%20of%20Each%20Continent) |

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

## MEDIUM 

| Title |

| :---: | 

| [The PADS](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Selection/The%20PADS) | 

| [Occupations](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Selection/Occupations) | 

| [Binary Tree Nodes](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Selection/Binary%20Tree%20Nodes) | 

| [New Companies](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Selection/New%20Companies)  | 

| [Weather Observation Station 18](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2018)  | 

| [Weather Observation Station 19](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2019)  | 

| [Weather Observation Station 20](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Aggregation/Weather%20Observation%20Station%2020)  | 

| [The Report](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/The%20Report)  | 

| [Top Competitors](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Top%20Competitors)  |

| [Ollivander's Inventory](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Ollivander's%20Inventory)  | 

| [Challenges](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Challenges)  |

| [Contest Leaderboard](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Basic%20Join/Contest%20Leaderboard) |

| [Placements](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Join/Placements)  |

| [SQL Project Planning](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Join/SQL%20Project%20Planning)  | 

| [Symmetric Pairs](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Join/Symmetric%20Pairs)  |

| [Print Prime Numbers](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Alternative%20Queries/Print%20Prime%20Numbers)  |

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

## HARD 

| Title |

| :---: | 

| [15 Days of Learning SQL](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Join/15%20Days%20of%20Learning%20SQL) | 

| [Interviews](https://github.com/tawfikhammad/SQL-Problems-Hackerrank/tree/main/Advanced%20Join/Interviews) |