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https://github.com/mohammed-bder/hackerrank-sql-solutions

This repository contains my solutions on Hacker Rank in SQL
https://github.com/mohammed-bder/hackerrank-sql-solutions
hackerrank-challenges hackerrank-solutions mssql sql sql-query
Last synced: 14 days ago
JSON representation
This repository contains my solutions on Hacker Rank in SQL
Host: GitHub
URL: https://github.com/mohammed-bder/hackerrank-sql-solutions
Owner: mohammed-bder
Created: 2024-08-10T20:50:59.000Z (6 months ago)
Default Branch: main
Last Pushed: 2024-08-14T11:01:12.000Z (6 months ago)
Last Synced: 2025-01-18T12:16:04.007Z (14 days ago)
Topics: hackerrank-challenges, hackerrank-solutions, mssql, sql, sql-query
Homepage:
Size: 33.2 KB
Stars: 0
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
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README

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# HackerRank-SQL-Solutions

  

	


	      

         

    

  




## Description

This repository contains My Solutions of SQL challenges on [HackerRank](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions) and you can see multiple solutions for the same challenge. The repository contains 4 folders. These folders contain solutions for easy, medium, and difficult challenges executed on an MS SQL environment.

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## Folders in the Repo

- [Basic Select](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/tree/main/Basic%20Select)

- [Advanced Select](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/tree/main/Advanced%20Select)

- [Aggregation](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/tree/main/Aggregation)

- [Basic Join](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/tree/main/Basic%20Join)

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## Basic Select Challenges

| Number | Challenges | Solutions |

|:------:|------------|:---------:|

| 1 | [Revising the Select Query I](https://www.hackerrank.com/challenges/revising-the-select-query/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/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) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Select/Revising%20the%20Select%20Query%20II.sql)

| 3 | [Select All](https://www.hackerrank.com/challenges/select-all-sql/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Select/Select%20All.sql)

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

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

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

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

| 8 | [Weather Observation Station 3](https://www.hackerrank.com/challenges/weather-observation-station-3/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Select/Weather%20Observation%20Station%203.sql)

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

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

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

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

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

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

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

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

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

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

| 19| [Employee Names](https://www.hackerrank.com/challenges/name-of-employees/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Select/Employee%20Names.sql)

| 20| [Employee Salaries](https://www.hackerrank.com/challenges/salary-of-employees/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Select/Employee%20Salaries.sql)

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## Advanced Select Challenges

| Number | Challenges | Solutions |

|:------:|------------|:---------:|

| 1 |[Type of Triangle](https://www.hackerrank.com/challenges/what-type-of-triangle/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Advanced%20Select/Type%20of%20Triangle.sql) 

| 2 |[The PADS](https://www.hackerrank.com/challenges/the-pads/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Advanced%20Select/The%20PADS.sql) 

| 3 |[Occupations](https://www.hackerrank.com/challenges/occupations/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Advanced%20Select/Occupations.sql) 

| 4 |[Binary Tree Nodes](https://www.hackerrank.com/challenges/binary-search-tree-1/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Advanced%20Select/Binary%20Tree%20Nodes.sql)

| 5 |[New Companies](https://www.hackerrank.com/challenges/the-company/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Advanced%20Select/New%20Companies.sql) 

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## Aggregation Challenges

| Number | Challenges | Solutions |

|:------:|------------|:---------:|

| 1 | [Revising Aggregations - The Count Function](https://www.hackerrank.com/challenges/revising-aggregations-the-count-function/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/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) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/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) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Revising%20Aggregations%20-%20Averages.sql)

| 4 | [Average Population](https://www.hackerrank.com/challenges/average-population/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Average%20Population.sql)

| 5 | [Japan Population](https://www.hackerrank.com/challenges/japan-population/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Japan%20Population.sql)

| 6 | [Population Density Difference](https://www.hackerrank.com/challenges/population-density-difference/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Population%20Density%20Difference.sql)

| 7 | [The Blunder](https://www.hackerrank.com/challenges/the-blunder/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/The%20Blunder.sql)

| 8 | [Top Earners](https://www.hackerrank.com/challenges/earnings-of-employees/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Top%20Earners.sql)   

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

| 10| [Weather Observation Station 13](https://www.hackerrank.com/challenges/weather-observation-station-13/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2013.sql)

| 11| [Weather Observation Station 14](https://www.hackerrank.com/challenges/weather-observation-station-14/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2014.sql)

| 12| [Weather Observation Station 15](https://www.hackerrank.com/challenges/weather-observation-station-15/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2015.sql)

| 13| [Weather Observation Station 16](https://www.hackerrank.com/challenges/weather-observation-station-16/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2016.sql)

| 14| [Weather Observation Station 17](https://www.hackerrank.com/challenges/weather-observation-station-17/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2017.sql)

| 15| [Weather Observation Station 18](https://www.hackerrank.com/challenges/weather-observation-station-18/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2018.sql)

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

| 17| [Weather Observation Station 20](https://www.hackerrank.com/challenges/weather-observation-station-20/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Aggregation/Weather%20Observation%20Station%2020.sql)

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## Basic Join Challenges

| Number | Challenges | Solutions |

|:------:|------------|:---------:|

| 1 | [African Cities](https://www.hackerrank.com/challenges/african-cities/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Join/African%20Cities.sql)

| 2 | [Average Population of Each Continent](https://www.hackerrank.com/challenges/average-population-of-each-continent/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Join/Average%20Population%20of%20Each%20Continent.sql)

| 3 | [Population Census](https://www.hackerrank.com/challenges/asian-population/problem) | [Solution](https://github.com/MohammedHasanAhmed/HackerRank-SQL-Solutions/blob/main/Basic%20Join/Population%20Census.sql)