https://github.com/keroloshany47/sql_problems

This repository documented my journy solving SQl problems in multi websites like LeetCode and Hacker Rank
https://github.com/keroloshany47/sql_problems

database hackerrank leetcode mysql sql sql-practice sql-query sql-server

Last synced: about 1 month ago
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This repository documented my journy solving SQl problems in multi websites like LeetCode and Hacker Rank

• Host: GitHub
• URL: https://github.com/keroloshany47/sql_problems
• Owner: keroloshany47
• Created: 2025-08-01T17:15:20.000Z (3 months ago)
• Default Branch: main
• Last Pushed: 2025-09-10T05:01:11.000Z (about 1 month ago)
• Last Synced: 2025-09-10T07:34:08.290Z (about 1 month ago)
• Topics: database, hackerrank, leetcode, mysql, sql, sql-practice, sql-query, sql-server
• Language: TSQL
• Homepage:
• Size: 544 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# SQL Problem-Solving

## Welcome

This repository is my active workshop for mastering SQL. It contains solutions to real-world problems from top platforms, demonstrating skills in querying, analysis, and efficient SQL techniques.

---

## Platforms & Tech Stack

I actively solve problems from:

![HackerRank](https://img.shields.io/badge/HackerRank-%2300CC55?style=plastic&logo=hackerrank&logoColor=white)

![LeetCode](https://img.shields.io/badge/LeetCode-%23FFA116?style=plastic&logo=leetcode&logoColor=black)

![SQL-Practice](https://img.shields.io/badge/SQL--Practice-%2300599C?style=plastic&logo=databricks&logoColor=white)

![DataLemur](https://img.shields.io/badge/DataLemur-%23FF3131?style=plastic&logo=readthedocs&logoColor=white)

---

##  Core Competencies

This repo showcases a diverse range of SQL skills — including:

- Writing clean, efficient queries

- Solving real-world case studies

- Understanding core database concepts

---

##  Skills Demonstrated

| Category          | Skills/Topics Demonstrated                                      |

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

| Aggregations       | `GROUP BY`, `COUNT`, `SUM`, `AVG`, `MAX`, `MIN`                |

| Joins              | `INNER JOIN`, `LEFT JOIN`, `RIGHT JOIN`, `FULL JOIN`           |

| Subqueries         | `WHERE`, `IN`, `EXISTS`, `ALL`, `ANY`                          |

| Window Functions   | `ROW_NUMBER`, `RANK`, `DENSE_RANK`, `NTILE`                    |

| Set Operations     | `UNION`, `INTERSECT`, `EXCEPT`                                 |

---

##  Technologies Used

This repository contains problem-solving SQL scripts written primarily in:

 ![SQL](https://img.shields.io/badge/SQL-Server-blue?logo=microsoftsqlserver)

 ![MySQL](https://img.shields.io/badge/MySQL-Used-blue?logo=mysql)

---

##  My Goals

-  Become SQL-proficient for real-world data tasks.

-  Master complex query techniques using modern SQL.

-  Build a strong portfolio through consistency and exploration.

---

##  Solved SQL Problems

 Total Solved: **194** problems  

 (from **LeetCode** , **HackerRank** , **DataLemur** , and **SQL-Practice**)

##  Contact With Me

-  Email: keroloshany47@gmail.com

-  [LinkedIn](https://www.linkedin.com/in/kerolos-hani-2519441b6/)

-  [GitHub Portfolio](https://github.com/keroloshany47)