{"id":27288386,"url":"https://github.com/gabrielcformiga/hackerrank-sql","last_synced_at":"2025-07-21T23:35:32.056Z","repository":{"id":285891307,"uuid":"959677031","full_name":"GabrielCFormiga/HackerRank-SQL","owner":"GabrielCFormiga","description":"Solutions to SQL problems from the HackerRank Online Judge using MySQL and SQL Style Guide from The GitLab 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align=\"center\"\u003e  \n\t\u003cbr\u003e\n\t\u003ca\u003e\n        \u003cimg height=\"50\" src=\"https://hrcdn.net/community-frontend/assets/brand/logo-new-white-green-a5cb16e0ae.svg\" alt=\"HackerRank Logo\"\u003e \n    \u003c/a\u003e\n    \u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\n    \u003cimg height=\"120\" src=\"https://www.mysql.com/common/logos/logo-mysql-170x115.png\" alt=\"MySQL Logo\"\u003e\n    \u003cbr\u003e\n    \u003cbr\u003e\n\u003c/p\u003e\n\n## Description\n\nThis repository contains my solutions to SQL problems from the **HackerRank Online Judge**.\n\nThe structure of the repository is simple: each folder is named according to the corresponding **subdomain**, and the solution files are organized by the **problem name**.\n\nAdditionally, all the problems can be easily accessed in the [**Problem Set**](#Problem-Set).\n\nAll solutions follow the SQL Style Guide from **The GitLab Handbook** to ensure readability and best practices.\n\n## Useful links\n\n- [My HackerRank profile](https://www.hackerrank.com/profile/gabriel_campfor) \n- [SQL Style Guide](https://handbook.gitlab.com/handbook/enterprise-data/platform/sql-style-guide/)\n- [SQLFluff](https://github.com/sqlfluff/sqlfluff) \n\n## Problem Set\n\n- [**Basic Select**](#Basic-Select)\n\n---\n\n### Basic Select\n\n| **Problem** | **Solution** |\n|------------|-------------|\n| [Revising the Select Query I](https://www.hackerrank.com/challenges/revising-the-select-query/problem) | [SQL](Basic%20Select/Revising%20the%20Select%20Query%201.sql) |\n| [Revising the Select Query II](https://www.hackerrank.com/challenges/revising-the-select-query-2/problem) | [SQL](Basic%20Select/Revising%20the%20Select%20Query%202.sql) |\n| [Select All](https://www.hackerrank.com/challenges/select-all-sql/problem) | [SQL](Basic%20Select/Select%20All.sql) |\n| [Select By ID](https://www.hackerrank.com/challenges/select-by-id/problem) | [SQL](Basic%20Select/Select%20By%20ID.sql) |\n| [Japanese Cities' Attributes](https://www.hackerrank.com/challenges/japanese-cities-attributes/problem) | [SQL](Basic%20Select/Japanese%20Cities%27%20Attributes.sql) |\n| [Japanese Cities' Names](https://www.hackerrank.com/challenges/japanese-cities-name/problem) | [SQL](Basic%20Select/Japanese%20Cities%27%20Names.sql) |\n| [Weather Observation Station 1](https://www.hackerrank.com/challenges/weather-observation-station-1/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%201.sql) |\n| [Weather Observation Station 3](https://www.hackerrank.com/challenges/weather-observation-station-3/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%203.sql) |\n| [Weather Observation Station 4](https://www.hackerrank.com/challenges/weather-observation-station-4/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%204.sql) |\n| [Weather Observation Station 5](https://www.hackerrank.com/challenges/weather-observation-station-5/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%205.sql) |\n| [Weather Observation Station 6](https://www.hackerrank.com/challenges/weather-observation-station-6/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%206.sql)\n| [Weather Observation Station 7](https://www.hackerrank.com/challenges/weather-observation-station-7/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%207.sql)\n| [Weather Observation Station 8](https://www.hackerrank.com/challenges/weather-observation-station-8/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%208.sql)\n| [Weather Observation Station 9](https://www.hackerrank.com/challenges/weather-observation-station-9/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%209.sql)\n| [Weather Observation Station 10](https://www.hackerrank.com/challenges/weather-observation-station-10/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%2010.sql)\n| [Weather Observation Station 11](https://www.hackerrank.com/challenges/weather-observation-station-11/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%2011.sql)\n| [Weather Observation Station 12](https://www.hackerrank.com/challenges/weather-observation-station-12/problem) | [SQL](Basic%20Select/Weather%20Observation%20Station%2012.sql)\n| [Higher Than 75 Marks](https://www.hackerrank.com/challenges/more-than-75-marks/problem) | [SQL](Basic%20Select/Higher%20Than%2075%20Marks.sql)\n| [Employee Names](https://www.hackerrank.com/challenges/name-of-employees/problem) | [SQL](Basic%20Select/Employee%20Names.sql)\n| [Employee Salaries](https://www.hackerrank.com/challenges/salary-of-employees/problem) | [SQL](Basic%20Select/Employee%20Salaries.sql)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgabrielcformiga%2Fhackerrank-sql","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgabrielcformiga%2Fhackerrank-sql","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgabrielcformiga%2Fhackerrank-sql/lists"}