Solutions to Problems For SQL on Leetcode, Hackerrank & DataLemur

Advanced SQL workbook: subqueries, window functions, CTEs, recursive CTEs, and datetime practice.

SQL skills challenge. A small but complete, beginner friendly project to practice basic/intermediate SQL skills.

An SQL analysis exploring the relationship between reported crimes in Chicago and the average daily temperature from 2018 through 2023.

An SQL data cleaning project

A list of the most common entry level SQL interview questions and answers.

SQL Case study solutions for #8WeekSQLChallenge by Danny Ma

An SQL analysis of traffic accidents within the City of Chicago limits and under the jurisdiction of Chicago Police Department (CPD).

Aliens of America. A portfolio building dataset provided by Ian K. on LinkedIn.

📚 My SQL learning journey — practicing from basics to advanced queries, joins, subqueries, views & more.

SQL/MySQL Cheatsheet and Practice Questions

i tried to solve as many tasks as possible to make my SQL skills better

Sql practice from cs50 course

SQL Case Files is a free interactive SQL game that teaches SQL through crime-solving challenges. Learn SQL online with hands-on puzzles, realistic datasets, SQL practice exercises, and a full browser-based SQLite database. Perfect for beginners learning SQL, data analysts preparing for interviews, and anyone who wants to practice SQL for free.

SQL Engineeering Handbook by Mohammad Ammar . Production-ready with SQL tutorials, interview questions, real-world projects, query optimization, window functions, and analytics engineering examples. Created by the Co-Founder of Apex Analyticx . Live Portfolio : https://theammarngp.lovable.app

A professional SQL project demonstrating core database management techniques, including CRUD operations, data validation, safe deletions, and transaction management.

One SQL problem a day for a year

Dictionary Challenge: An SQL project using basic/intermediate SQL practices with one column of English words.

A professional SQL project demonstrating the implementation of relational database concepts, focusing on Foreign Key Constraints and ON DELETE CASCADE behavior.

A dataset used to explore work-related fatalities in the United States.